Justice GINSBURG delivered the opinion of the Court.

This case requires us to decide how immigration judges should apply a deportation (removal) provision, defined with reference to federal drug laws, to an alien convicted of a state drug-paraphernalia misdemeanor.

Lawful permanent resident Moones Mellouli, in 2010, pleaded guilty to a misdemeanor offense under Kansas law, the possession of drug paraphernalia to "store, contain, conceal, inject, ingest, inhale or otherwise introduce a controlled substance into the human body." Kan. Stat. Ann. § 21-5709(b)(2) (2013 Cum. Supp.). The sole "paraphernalia" Mellouli was charged with possessing was a sock in which he had placed four orange tablets. The criminal charge and plea agreement did not identify the controlled substance involved, but Mellouli had acknowledged, prior to the charge and plea, that the tablets were Adderall. Mellouli was sentenced to a suspended term of 359 days and 12 months' probation.

In February 2012, several months after Mellouli successfully completed probation, Immigration and Customs Enforcement officers arrested him as deportable under 8 U.S.C. § 1227(a)(2)(B)(i) based on his Kansas misdemeanor conviction. Section 1227(a)(2)(B)(i) authorizes the removal of an alien "convicted of a violation of . . . any law or regulation of a State, the United States, or a foreign country relating to a controlled substance (as defined in section 802 of Title 21)." We hold that Mellouli's Kansas conviction for concealing unnamed pills in his sock did not trigger removal under § 1227(a)(2)(B)(i). The drug-paraphernalia possession law under which he was convicted, Kan. Stat. Ann. § 21-5709(b), by definition, related to a controlled substance: The Kansas statute made it unlawful "to use or possess with intent to use any drug paraphernalia to. . . store [or] conceal . . . a controlled substance." But it was immaterial under that law whether the substance was defined in 21 U.S.C. § 802. Nor did the State charge, or seek to prove, that Mellouli possessed a substance on the § 802 schedules. Federal law (§ 1227(a)(2)(B)(i)), therefore, did not authorize Mellouli's removal.

I

A

This case involves the interplay between several federal and state statutes. Section 1227(a)(2)(B)(i), a provision of the Immigration and Nationality Act, 66 Stat. 163, as amended, authorizes the removal of an alien "convicted of a violation of . . . any law or regulation of a State, the United States, or a foreign country relating to a controlled substance (as defined in section 802 of Title 21), other than a single offense involving possession for one's own use of 30 grams or less of marijuana." Section 1227(a)(2)(B)(i) incorporates 21 U.S.C. § 802, which limits the term "controlled substance" to a "drug or other substance" included in one of five federal schedules. § 802(6).

The statute defining the offense to which Mellouli pleaded guilty, Kan. Stat. Ann. § 21-5709(b), proscribes "possess[ion] with intent to use any drug paraphernalia to," among other things, "store" or "conceal" a "controlled substance." Kansas defines "controlled substance" as any drug included on its own schedules, and makes no reference to § 802 or any other federal law. § 21-5701(a).1 At the time of Mellouli's conviction, Kansas' schedules included at least nine substances not included in the federal lists. See § 65-4105(d)(30), (31), (33), (34), (36) (2010 Cum. Supp.); § 65-4111(g) (2002); § 65-4113(d)(1), (e), (f) (2010 Cum. Supp.); see also Brief for Respondent 9, n. 2.

The question presented is whether a Kansas conviction for using drug paraphernalia to store or conceal a controlled substance, § 21-5709(b), subjects an alien to deportation under § 1227(a)(2)(B)(i), which applies to an alien "convicted of a violation of [a state law] relating to a controlled substance (as defined in [§ 802])."

B

Mellouli, a citizen of Tunisia, entered the United States on a student visa in 2004. He attended U.S. universities, earning a bachelor of arts degree, magna cum laude, as well as master's degrees in applied mathematics and economics. After completing his education, Mellouli worked as an actuary and taught mathematics at the University of Missouri-Columbia. In 2009, he became a conditional permanent resident and, in 2011, a lawful permanent resident. Since December 2011, Mellouli has been engaged to be married to a U.S. citizen.

In 2010, Mellouli was arrested for driving under the influence and driving with a suspended license. During a postarrest search in a Kansas detention facility, deputies discovered four orange tablets hidden in Mellouli's sock. According to a probable-cause affidavit submitted in the state prosecution, Mellouli acknowledged that the tablets were Adderall and that he did not have a prescription for the drugs. Adderall, the brand name of an amphetaminebased drug typically prescribed to treat attention-deficit hyperactivity disorder,2 is a controlled substance under both federal and Kansas law. See 21 CFR § 1308.12(d)(1) (2014) (listing "amphetamine" and its "salts" and "isomers"); Kan. Stat. Ann. § 65-4107(d)(1) (2013 Cum. Supp.) (same). Based on the probable-cause affidavit, a criminal complaint was filed charging Mellouli with trafficking contraband in jail.

Ultimately, Mellouli was charged with only the lesser offense of possessing drug paraphernalia, a misdemeanor. The amended complaint alleged that Mellouli had "use[d] or possess[ed] with intent to use drug paraphernalia, to-wit: a sock, to store, contain, conceal, inject, ingest, inhale or otherwise introduce into the human body a controlled substance." App. 23. The complaint did not identify the substance contained in the sock. Mellouli pleaded guilty to the paraphernalia possession charge; he also pleaded guilty to driving under the influence. For both offenses, Mellouli was sentenced to a suspended term of 359 days and 12 months' probation.

In February 2012, several months after Mellouli successfully completed probation, Immigration and Customs Enforcement officers arrested him as deportable under § 1227(a)(2)(B)(i) based on his paraphernalia possession conviction. An Immigration Judge ordered Mellouli deported, and the Board of Immigration Appeals (BIA) affirmed the order. Mellouli was deported in 2012.

Under federal law, Mellouli's concealment of controlled-substance tablets in his sock would not have qualified as a drug-paraphernalia offense. Federal law criminalizes the sale of or commerce in drug paraphernalia, but possession alone is not criminalized at all. See 21 U.S.C. § 863(a)-(b). Nor does federal law define drug paraphernalia to include common household or ready-to-wear items like socks; rather, it defines paraphernalia as any "equipment, product, or material" which is "primarily intended or designed for use" in connection with various drug-related activities. § 863(d) (emphasis added). In 19 States as well, the conduct for which Mellouli was convicted—use of a sock to conceal a controlled substance—is not a criminal offense. Brief for National Immigrant Justice Center et al. as Amici Curiae 7. At most, it is a low-level infraction, often not attended by a right to counsel. Id., at 9-11.

The Eighth Circuit denied Mellouli's petition for review. 719 F.3d 995 (2013). We granted certiorari, 573 U.S. ___, 134 S.Ct. 2873, 189 L.Ed.2d 831 (2014), and now reverse the judgment of the Eighth Circuit.

II

We address first the rationale offered by the BIA and affirmed by the Eighth Circuit, which differentiates paraphernalia offenses from possession and distribution offenses. Essential background, in evaluating the rationale shared by the BIA and the Eighth Circuit, is the categorical approach historically taken in determining whether a state conviction renders an alien removable under the immigration statute.3 Because Congress predicated deportation "on convictions, not conduct," the approach looks to the statutory definition of the offense of conviction, not to the particulars of an alien's behavior. Das, The Immigration Penalties of Criminal Convictions: Resurrecting Categorical Analysis in Immigration Law, 86 N.Y.U. L. Rev. 1669, 1701, 1746 (2011). The state conviction triggers removal only if, by definition, the underlying crime falls within a category of removable offenses defined by federal law. Ibid. An alien's actual conduct is irrelevant to the inquiry, as the adjudicator must "presume that the conviction rested upon nothing more than the least of the acts criminalized" under the state statute. Moncrieffe v. Holder, 569 U.S. ___, ___, 133 S.Ct. 1678, 1684-1685, 185 L.Ed.2d 727 (2013) (internal quotation marks and alterations omitted).4

The categorical approach "has a long pedigree in our Nation's immigration law." Id., at ___, 133 S.Ct., at 1685. As early as 1913, courts examining the federal immigration statute concluded that Congress, by tying immigration penalties to convictions, intended to "limi[t] the immigration adjudicator's assessment of a past criminal conviction to a legal analysis of the statutory offense," and to disallow "[examination] of the facts underlying the crime." Das, supra, at 1688, 1690.

Rooted in Congress' specification of conviction, not conduct, as the trigger for immigration consequences, the categorical approach is suited to the realities of the system. Asking immigration judges in each case to determine the circumstances underlying a state conviction would burden a system in which "large numbers of cases [are resolved by] immigration judges and front-line immigration officers, often years after the convictions." Koh, The Whole Better than the Sum: A Case for the Categorical Approach to Determining the Immigration Consequences of Crime, 26 Geo. Immigration L. J. 257, 295 (2012). By focusing on the legal question of what a conviction necessarily established, the categorical approach ordinarily works to promote efficiency, fairness, and predictability in the administration of immigration law. See id., at 295-310; Das, supra, at 1725-1742. In particular, the approach enables aliens "to anticipate the immigration consequences of guilty pleas in criminal court," and to enter "`safe harbor' guilty pleas [that] do not expose the [alien defendant] to the risk of immigration sanctions." Koh, supra, at 307. See Das, supra, at 1737-1738.5

The categorical approach has been applied routinely to assess whether a state drug conviction triggers removal under the immigration statute. As originally enacted, the removal statute specifically listed covered offenses and covered substances. It made deportable, for example, any alien convicted of "import[ing]," "buy[ing]," or "sell[ing]" any "narcotic drug," defined as "opium, coca leaves, cocaine, or any salt, derivative, or preparation of opium or coca leaves, or cocaine." Ch. 202, 42 Stat. 596-597. Over time, Congress amended the statute to include additional offenses and additional narcotic drugs.6 Ultimately, the Anti-Drug Abuse Act of 1986 replaced the increasingly long list of controlled substances with the now familiar reference to "a controlled substance (as defined in [§ 802])." See § 1751, 100 Stat. 3207-47. In interpreting successive versions of the removal statute, the BIA inquired whether the state statute under which the alien was convicted covered federally controlled substances and not others.7

Matter of Paulus, 11 I. & N. Dec. 274 (1965), is illustrative. At the time the BIA decided Paulus, the immigration statute made deportable any alien who had been "convicted of a violation of . . . any law or regulation relating to the illicit possession of or traffic in narcotic drugs or marihuana." Id., at 275. California controlled certain "narcotics," such as peyote, not listed as "narcotic drugs" under federal law. Ibid. The BIA concluded that an alien's California conviction for offering to sell an unidentified "narcotic" was not a deportable offense, for it was possible that the conviction involved a substance, such as peyote, controlled only under California law. Id., at 275-276. Because the alien's conviction was not necessarily predicated upon a federally controlled "narcotic drug," the BIA concluded that the conviction did not establish the alien's deportability. Id., at 276.

Under the Paulus analysis, adhered to as recently as 2014 in Matter of Ferreira, 26 I. & N. Dec. 415 (BIA 2014),8 Mellouli would not be deportable. Mellouli pleaded guilty to concealing unnamed pills in his sock. At the time of Mellouli's conviction, Kansas' schedules of controlled substances included at least nine substances—e.g., salvia and jimson weed—not defined in § 802. See Kan. Stat. Ann. § 65-4105(d)(30), (31). The state law involved in Mellouli's conviction, therefore, like the California statute in Paulus, was not confined to federally controlled substances; it required no proof by the prosecutor that Mellouli used his sock to conceal a substance listed under § 802, as opposed to a substance controlled only under Kansas law. Under the categorical approach applied in Paulus, Mellouli's drug-paraphernalia conviction does not render him deportable. In short, the state law under which he was charged categorically "relat[ed] to a controlled substance," but was not limited to substances "defined in [§ 802]."9

The BIA, however, announced and applied a different approach to drug-paraphernalia offenses (as distinguished from drug possession and distribution offenses) in Matter of Martinez Espinoza, 25 I. & N. Dec. 118 (2009). There, the BIA ranked paraphernalia statutes as relating to "the drug trade in general." Id., at 121. The BIA rejected the argument that a paraphernalia conviction should not count at all because it targeted implements, not controlled substances. Id., at 120. It then reasoned that a paraphernalia conviction "relates to" any and all controlled substances, whether or not federally listed, with which the paraphernalia can be used. Id., at 121. Under this reasoning, there is no need to show that the type of controlled substance involved in a paraphernalia conviction is one defined in § 802.

The Immigration Judge in this case relied upon Martinez Espinoza in ordering Mellouli's removal, quoting that decision for the proposition that "`the requirement of a correspondence between the Federal and State controlled substance schedules, embraced by Matter of Paulus . . . has never been extended'" to paraphernalia offenses. App. to Pet. for Cert. 32 (quoting Martinez Espinoza, 25 I. & N. Dec., at 121). The BIA affirmed, reasoning that Mellouli's conviction for possession of drug paraphernalia "involves drug trade in general and, thus, is covered under [§ 1227(a)(2)(B)(i)]." App. to Pet. for Cert. 18. Denying Mellouli's petition for review, the Eighth Circuit deferred to the BIA's decision in Martinez Espinoza, and held that a Kansas paraphernalia conviction "`relates to' a federal controlled substance because it is a crime . . . `associated with the drug trade in general.'" 719 F.3d, at 1000.

The disparate approach to state drug convictions, devised by the BIA and applied by the Eighth Circuit, finds no home in the text of § 1227(a)(2)(B)(i). The approach, moreover, "leads to consequences Congress could not have intended." Moncrieffe, 569 U.S., at ___, 133 S.Ct., at 1690. Statutes should be interpreted "as a symmetrical and coherent regulatory scheme." FDA v. Brown & Williamson Tobacco Corp., 529 U.S. 120, 133, 120 S.Ct. 1291, 146 L.Ed.2d 121 (2000) (internal quotation marks omitted). The BIA, however, has adopted conflicting positions on the meaning of § 1227(a)(2)(B)(i), distinguishing drug possession and distribution offenses from offenses involving the drug trade in general, with the anomalous result that minor paraphernalia possession offenses are treated more harshly than drug possession and distribution offenses. Drug possession and distribution convictions trigger removal only if they necessarily involve a federally controlled substance, see Paulus, 11 I. & N. Dec. 274, while convictions for paraphernalia possession, an offense less grave than drug possession and distribution, trigger removal whether or not they necessarily implicate a federally controlled substance, see Martinez Espinoza, 25 I. & N. Dec. 118. The incongruous upshot is that an alien is not removable for possessing a substance controlled only under Kansas law, but he is removable for using a sock to contain that substance. Because it makes scant sense, the BIA's interpretation, we hold, is owed no deference under the doctrine described in Chevron U.S.A. Inc. v. Natural Resources Defense Council, Inc., 467 U.S. 837, 843, 104 S.Ct. 2778, 81 L.Ed.2d 694 (1984).

III

Offering an addition to the BIA's rationale, the Eighth Circuit reasoned that a state paraphernalia possession conviction categorically relates to a federally controlled substance so long as there is "nearly a complete overlap" between the drugs controlled under state and federal law. 719 F.3d, at 1000.10 The Eighth Circuit's analysis, however, scarcely explains or ameliorates the BIA's anomalous separation of paraphernalia possession offenses from drug possession and distribution offenses.

Apparently recognizing this problem, the Government urges, as does the dissent, that the overlap between state and federal drug schedules supports the removal of aliens convicted of any drug crime, not just paraphernalia offenses. As noted, § 1227(a)(2)(B)(i) authorizes the removal of any alien "convicted of a violation of . . . any law or regulation of a State, the United States, or a foreign country relating to a controlled substance (as defined in [§ 802])." According to the Government, the words "relating to" modify "law or regulation," rather than "violation." Brief for Respondent 25-26 (a limiting phrase ordinarily modifies the last antecedent). Therefore, the Government argues, aliens who commit "drug crimes" in States whose drug schedules substantially overlap the federal schedules are removable, for "state statutes that criminalize hundreds of federally controlled drugs and a handful of similar substances, are laws `relating to' federally controlled substances." Brief for Respondent 17.

We do not gainsay that, as the Government urges, the last reasonable referent of "relating to," as those words appear in § 1227(a)(2)(B)(i), is "law or regulation." The removal provision is thus satisfied when the elements that make up the state crime of conviction relate to a federally controlled substance. As this case illustrates, however, the Government's construction of the federal removal statute stretches to the breaking point, reaching state-court convictions, like Mellouli's, in which "[no] controlled substance (as defined in [§ 802])" figures as an element of the offense. We recognize, too, that the § 1227(a)(2)(B)(i) words to which the dissent attaches great weight, i.e., "relating to," post, at 1991 - 1992, are "broad" and "indeterminate." Maracich v. Spears, 570 U.S. ___, ___ 133 S.Ct. 2191, 2199-2200, 186 L.Ed.2d 275 (2013) (internal quotation marks and brackets omitted).11 As we cautioned in New York State Conference of Blue Cross & Blue Shield Plans v. Travelers Ins. Co., 514 U.S. 645, 655, 115 S.Ct. 1671, 131 L.Ed.2d 695 (1995), those words, "extend[ed] to the furthest stretch of [their] indeterminacy, . . . stop nowhere." "[C]ontext," therefore, may "tu[g] . . . in favor of a narrower reading." Yates v. United States, 574 U.S. ___, ___, 135 S.Ct. 1074, 1083, 191 L.Ed.2d 64 (2015). Context does so here.

The historical background of § 1227(a)(2)(B)(i) demonstrates that Congress and the BIA have long required a direct link between an alien's crime of conviction and a particular federally controlled drug. Supra, at 1987 - 1988. The Government's position here severs that link by authorizing deportation any time the state statute of conviction bears some general relation to federally controlled drugs. The Government offers no cogent reason why its position is limited to state drug schedules that have a "substantial overlap" with the federal schedules. Brief for Respondent 31. A statute with any overlap would seem to be related to federally controlled drugs. Indeed, the Government's position might well encompass convictions for offenses related to drug activity more generally, such as gun possession, even if those convictions do not actually involve drugs (let alone federally controlled drugs). The Solicitor General, while resisting this particular example, acknowledged that convictions under statutes "that have some connection to drugs indirectly" might fall within § 1227(a)(2)(B)(i). Tr. of Oral Arg. 36. This sweeping interpretation departs so sharply from the statute's text and history that it cannot be considered a permissible reading.

In sum, construction of § 1227(a)(2)(B)(i) must be faithful to the text, which limits the meaning of "controlled substance," for removal purposes, to the substances controlled under § 802. We therefore reject the argument that any drug offense renders an alien removable, without regard to the appearance of the drug on a § 802 schedule. Instead, to trigger removal under § 1227(a)(2)(B)(i), the Government must connect an element of the alien's conviction to a drug "defined in [§ 802]."

* * *

For the reasons stated, the judgment of the U.S. Court of Appeals for the Eighth Circuit is reversed.

It is so ordered.

Justice THOMAS, with whom Justice ALITO joins, dissenting.

The Court reverses the decision of the United States Court of Appeals for the Eighth Circuit on the ground that it misapplied the federal removal statute. It rejects the Government's interpretation of that statute, which would supply an alternative ground for affirmance. Yet it offers no interpretation of its own. Lower courts are thus left to guess which convictions qualify an alien for removal under 8 U.S.C. § 1227(a)(2)(B)(i), and the majority has deprived them of their only guide: the statutory text itself. Because the statute renders an alien removable whenever he is convicted of violating a law "relating to" a federally controlled substance, I would affirm.

I

With one exception not applicable here, § 1227(a)(2)(B)(i) makes removable "[a]ny alien who at any time after admission has been convicted of a violation of (or a conspiracy or attempt to violate) any law or regulation of a State, the United States, or a foreign country relating to a controlled substance (as defined in section 802 of title 21)." I would hold, consistent with the text, that the provision requires that the conviction arise under a "law or regulation of a State, the United States, or a foreign country relating to a controlled substance (as defined in section 802 of title 21)." Thus, Mellouli was properly subject to removal if the Kansas statute of conviction "relat[es] to a controlled substance (as defined in section 802 of title 21)," regardless of whether his particular conduct would also have subjected him to prosecution under federal controlled-substances laws. See ante, at 1986 ("An alien's actual conduct is irrelevant to the inquiry"). The majority's 12 references to the sock that Mellouli used to conceal the pills are thus entirely beside the point.1

The critical question, which the majority does not directly answer, is what it means for a law or regulation to "relat[e] to a controlled substance (as defined in section 802 of title 21)." At a minimum, we know that this phrase does not require a complete overlap between the substances controlled under the state law and those controlled under 21 U.S.C. § 802. To "relate to" means "`to stand in some relation; to have bearing or concern; to pertain; refer; to bring into association with or connection with.'" Morales v. Trans World Airlines, Inc., 504 U.S. 374, 383, 112 S.Ct. 2031, 119 L.Ed.2d 157 (1992) (quoting Black's Law Dictionary 1158 (5th ed. 1979)). In ordinary parlance, one thing can "relate to" another even if it also relates to other things. As ordinarily understood, therefore, a state law regulating various controlled substances may "relat[e] to a controlled substance (as defined in section 802 of title 21)" even if the statute also controls a few substances that do not fall within the federal definition.

The structure of the removal statute confirms this interpretation. Phrases like "relating to" and "in connection with" have broad but indeterminate meanings that must be understood in the context of "the structure of the statute and its other provisions." Maracich v. Spears, 570 U.S. ___, ___, 133 S.Ct. 2191, 2200, 186 L.Ed.2d 275 (2013) ("in connection with"); see also New York State Conference of Blue Cross & Blue Shield Plans v. Travelers Ins. Co., 514 U.S. 645, 655, 115 S.Ct. 1671, 131 L.Ed.2d 695 (1995) ("relate to"); see generally California Div. of Labor Standards Enforcement v. Dillingham Constr., N.A., Inc., 519 U.S. 316, 324, 117 S.Ct. 832, 136 L.Ed.2d 791 (1997) (describing the Court's efforts to interpret the "`clearly expansive'" "relate to" language in the pre-emption provision of the Employee Retirement Income Security Act of 1974). In interpreting such phrases, we must be careful to honor Congress' choice to use expansive language. Maracich, supra, at ___, 133 S.Ct., at 2199 (GINSBURG, J., dissenting) (noting that a statute should be interpreted broadly in light of Congress' decision to use sweeping language like "in connection with"); see also, e.g., Alaska Dept. of Environmental Conservation v. EPA, 540 U.S. 461, 484, 124 S.Ct. 983, 157 L.Ed.2d 967 (2004) (GINSBURG, J.) (interpreting Environmental Protection Agency's authority in light of the "notably capacious terms" contained in its authorizing statute).

Here, the "structure of the statute and its other provisions" indicate that Congress understood this phrase to sweep quite broadly. Several surrounding subsections of the removal statute reveal that when Congress wanted to define with greater specificity the conduct that subjects an alien to removal, it did so by omitting the expansive phrase "relating to." For example, a neighboring provision makes removable "[a]ny alien who . . . is convicted under any law of purchasing, selling, offering for sale, exchanging, using, owning, possessing, or carrying . . . any weapon, part, or accessory which is a firearm or destructive device (as defined in section 921(a) of title 18)." 8 U.S.C. § 1227(a)(2)(C) (emphasis added). This language explicitly requires that the object of the offense fit within a federal definition. Other provisions adopt similar requirements. See, e.g., § 1227(a)(2)(E)(i) (making removable "[a]ny alien who . . . is convicted of a crime of domestic violence," where "the term `crime of domestic violence' means any crime of violence (as defined in section 16 of title 18) . . . committed by" a person with a specified family relationship with the victim); see generally § 1101(a)(43) (defining certain aggravated felonies using federal definitions as elements). That Congress, in this provision, required only that a law relate to a federally controlled substance, as opposed to involve such a substance, suggests that it understood "relating to" as having its ordinary and expansive meaning. See, e.g., Russello v. United States, 464 U.S. 16, 23, 104 S.Ct. 296, 78 L.Ed.2d 17 (1983).

Applying this interpretation of "relating to," a conviction under Kansas' drug paraphernalia statute qualifies as a predicate offense under § 1227(a)(2)(B)(i). That state statute prohibits the possession or use of drug paraphernalia to "store, contain, conceal, inject, ingest, inhale or otherwise introduce a controlled substance into the human body." Kan. Stat. Ann. § 21-5709(b)(2) (2013 Cum. Supp.). And, as used in this statute, a "controlled substance" is a substance that appears on Kansas' schedules, § 21-5701(a), which in turn consist principally of federally controlled substances. Ante, at 1984 - 1985; see also Brief for Petitioner 3 (listing nine substances on Kansas' schedules that were not on the federal schedules at the time of Mellouli's arrest); Brief for Respondent 8 (noting that, at the time of Mellouli's arrest, more than 97 percent of the named substances on Kansas' schedules were federally controlled). The law certainly "relat[es] to a controlled substance (as defined in section 802 of title 21)" because it prohibits conduct involving controlled substances falling within the federal definition in § 802.

True, approximately three percent of the substances appearing on Kansas' lists of "controlled substances" at the time of Mellouli's conviction did not fall within the federal definition, ante, at 1984 - 1985, meaning that an individual convicted of possessing paraphernalia may never have used his paraphernalia with a federally controlled substance. But that fact does not destroy the relationship between the law and federally controlled substances. Mellouli was convicted for violating a state law "relating to a controlled substance (as defined in section 802 of title 21)," so he was properly removed under 8 U.S.C. § 1227(a)(2)(B)(i).

II

A

The majority rejects this straightforward interpretation because it "reach[es] state-court convictions . . . in which `[no] controlled substance (as defined in [§ 802])' figures as an element of the offense." Ante, at 1990. This assumes the answer to the question at the heart of this case: whether the removal statute does in fact reach such convictions. To answer that question by assuming the answer is circular.

The majority hints that some more limited definition of "relating to" is suggested by context. See ibid. I wholeheartedly agree that we must look to context to understand indeterminate terms like "relating to," which is why I look to surrounding provisions of the removal statute. These "reveal that when Congress wanted to define with greater specificity the conduct that subjects an alien to removal, it did so by omitting the expansive phrase `relating to.'" Supra, at 1992. For its part, the majority looks to the context of other provisions referring to "controlled substances" without a definitional parenthetical, ante, at 1990, n. 11, and rejoins that the most natural reading of the statute "shrinks to the vanishing point the words `as defined in [§ 802],'" ante, at 1988, n. 9. But the definition of controlled substances does play a role in my interpretation, by requiring that the law bear some relationship to federally controlled substances. Although we need not establish the precise boundaries of that relationship in this case given that Kansas' paraphernalia law clearly qualifies under any reasonable definition of "relating to," the definition of controlled substances imposes a meaningful limit on the statutes that qualify.

B

The majority appears to conclude that a statute "relates to" a federally controlled substance if its "definition of the offense of conviction" necessarily includes as an element of that offense a federally controlled substance. Ante, at 1986. The text will not bear this meaning.

The first problem with the majority's interpretation is that it converts a removal provision expressly keyed to features of the statute itself into one keyed to features of the underlying generic offense. To understand the difference, one need look no further than this Court's decision in Moncrieffe v. Holder, 569 U.S. ___, 133 S.Ct. 1678, 185 L.Ed.2d 727 (2013). In that case, removal was predicated on the generic offense of "illicit trafficking in a controlled substance." Id., at ___, 133 S.Ct., at 1683. Thus, in order to satisfy the federal criteria, it was necessary for the state offense at issue to have as elements the same elements that make up that generic offense. Id., at ___, 133 S.Ct., at 1684-1685. By contrast, § 1227(a)(2)(B)(i) does not refer to a generic offense for which we must discern the relevant criteria from its nature. Instead, it establishes the relevant criteria explicitly, and does so for the law of conviction itself rather than for some underlying generic offense—that is, the law of conviction must "relat[e] to" a federally controlled substance.

The only plausible way of reading the text here to refer to a generic offense that has as one element the involvement of a federally controlled substance would be to read "relating to" as modifying "violation" instead of "law." Under that reading, the statute would attach immigration consequences to a "violation . . . relating to a controlled substance (as defined in section 802 of title 21)," rather than a violation of a "law . . . relating to a controlled substance (as defined in section 802 of title 21)." Yet the majority expressly—and correctly—rejects as grammatically incorrect Mellouli's argument that the "relating to" clause modifies "violation." Ante, at 1989 - 1990.

Having done so, the majority can reconcile its outcome with the text only by interpreting the words "relating to" to mean "regulating only." It should be obvious why the majority does not make this argument explicit. Even assuming "regulating only" were a permissible interpretation of "relating to"—for it certainly is not the most natural one—that interpretation would be foreclosed by Congress' pointed word choice in the surrounding provisions. And given the logical upshot of the majority's interpretation, it is it even more understandable that it avoids offering an explicit exegesis. For unless the Court ultimately adopts the modified categorical approach for statutes, like the one at issue here, that define offenses with reference to "controlled substances" generally, and treats them as divisible by each separately listed substance, ante, at 1986, n. 4, its interpretation would mean that no conviction under a controlled-substances regime more expansive than the Federal Government's would trigger removal.2 Thus, whenever a State moves first in subjecting some newly discovered drug to regulation, every alien convicted during the lag between state and federal regulation would be immunized from the immigration consequences of his conduct. Cf. Brief for Respondent 10 (explaining that two of the nine nonfederally controlled substances on Kansas' schedules at the time Mellouli was arrested became federally controlled within a year of his arrest). And the Government could never, under § 1227(a)(2)(B)(i), remove an alien convicted of violating the controlled-substances law of a State that defines "controlled substances" with reference to a list containing even one substance that does not appear on the federal schedules.

Finding no support for its position in the text, the majority relies on the historical background, ante, at 1990, and especially the Board of Immigration Appeals' (BIA) decision in Matter of Paulus, 11 I. & N. Dec. 274 (1965)—a surprising choice, given that the majority concludes its discussion of that history by acknowledging that the BIA's atextual approach to the statute makes "scant sense," ante, at 1988 - 1989. To the extent that the BIA's approach to § 1227(a)(2)(B)(i) and its predecessors is consistent with the majority's, it suffers from the same flaw: It fails to account for the text of the removal provision because it looks at whether the conviction itself necessarily involved a substance regulated under federal law, not at whether the statute related to one. See Paulus, 11 I. & N. Dec., at 276 ("[O]nly a conviction for illicit possession of or traffic in a substance which is defined as a narcotic drug under federal laws can be the basis for deportation" (emphasis added)); Matter of Ferreira, 26 I. & N. Dec. 415, 418-419 (BIA 2014) (modeling its categorical approach to § 1227(a)(2)(B)(i) after the analysis in Moncrieffe, which, as explained above, keyed removal to the characteristics of the offense).

Section 1227(a)(2)(B)(i) requires only that the state law itself, not the "generic" offense defined by the law, "relat[e] to" a federally controlled substance. The majority has not offered a textual argument capable of supporting a different conclusion.

* * *

The statutory text resolves this case. True, faithfully applying that text means that an alien may be deported for committing an offense that does not involve a federally controlled substance. Nothing about that consequence, however, is so out-landish as to call this application into doubt. An alien may be removed only if he is convicted of violating a law, and I see nothing absurd about removing individuals who are unwilling to respect the drug laws of the jurisdiction in which they find themselves.

The majority thinks differently, rejecting the only plausible reading of this provision and adopting an interpretation that finds no purchase in the text. I fail to understand why it chooses to do so, apart from a gut instinct that an educated professional engaged to an American citizen should not be removed for concealing unspecified orange tablets in his sock. Or perhaps the majority just disapproves of the fact that Kansas, exercising its police powers, has decided to criminalize conduct that Congress, exercising its limited powers, has decided not to criminalize, ante, at 1985 - 1986. Either way, that is not how we should go about interpreting statutes, and I respectfully dissent.