OPINION

McKEOWN, Circuit Judge:

As part of its oversight of drugs subject to the Controlled Substances Act ("CSA"), the United States Drug Enforcement Administration ("DEA") regularly issues investigative subpoenas. Those subpoenas are issued without prior approval by a court. In response to two recent subpoenas, Oregon's Prescription Drug Monitoring Program ("Oregon," the "Oregon Program," or "PDMP") sought a declaratory judgment that, under state law, the DEA must obtain a court order to enforce the subpoenas. The Oregon Program did not claim, however, that the DEA must obtain a warrant backed by probable cause.

The ACLU Foundation of Oregon and five individuals (collectively "Intervenors") intervened, arguing that the DEA's use of subpoenas violates their Fourth Amendment rights. They sought declaratory and injunctive relief prohibiting the DEA from obtaining prescription records from the PDMP without a warrant supported by probable cause. The district court did not analyze whether Intervenors have standing to bring this claim. Instead, it reached the merits of the Fourth Amendment claim and found that the DEA's use of administrative subpoenas violated privacy interests asserted by Intervenors in certain prescription information. We reverse without reaching the merits of the Fourth Amendment claim because Intervenors lack Article III standing to seek relief different from that sought by Oregon. Just this month the Supreme Court clarified this independent standing requirement for intervenors. See Town of Chester v. Laroe Estates, ___ U.S. ___, ___, 137 S.Ct. 1645, 1651, ___ L.Ed.2d ___ (2017) ("[A]n intervenor of right must have Article III standing in order to pursue relief that is different from that which is sought by a party with standing."). We also hold that the federal administrative subpoena statute, 21 U.S.C. § 876, preempts Oregon's statutory court order requirement, Or. Rev. Stat. § 431A.865.1

Background

I. The Controlled Substances Act

Congress enacted the CSA as part of the Comprehensive Drug Abuse Prevention and Control Act of 1970. 21 U.S.C. § 801 et seq.; Gonzales v. Raich, 545 U.S. 1, 12, 125 S.Ct. 2195, 162 L.Ed.2d 1 (2005). The CSA's main objectives are "to conquer drug abuse and to control the legitimate and illegitimate traffic in controlled substances." Gonzales, 545 U.S. at 12, 125 S.Ct. 2195. To achieve these goals, Congress established a "comprehensive regime" that makes it unlawful to manufacture, distribute, dispense, or possess any controlled substance except as authorized by the CSA. Id. at 12-13, 125 S.Ct. 2195 (citing 21 U.S.C. §§ 841(a)(1), 844(a)). Controlled substances are categorized into five schedules based on the drugs' potential for abuse, accepted medical uses, and likelihood of causing psychological or physical dependency. 21 U.S.C. § 812.

Under the CSA, the Attorney General is authorized to issue administrative subpoenas to investigate drug crimes:

21 U.S.C. § 876(a). This authority has been delegated to the DEA. See 28 C.F.R. § 0.100. Section 876(c) provides for judicial enforcement of subpoenas issued under § 876(a): "In the case of contumacy by or refusal to obey a subp[o]ena issued to any person, the Attorney General may invoke the aid of any court of the United States within the jurisdiction of which the investigation is carried on ... to compel compliance with the subp[o]ena."

II. The Oregon Program

The Oregon PDMP is operated by the Oregon Health Authority, which maintains records about prescriptions of drugs classified in Schedules II-IV under the CSA. Or. Rev. Stat. § 431A.855. When pharmacies in Oregon dispense a covered prescription drug, they are required to report electronically to the PDMP, among other things, the patient's name, address, date of birth, and sex; the dispensing pharmacy's identity; and the prescribing practitioner's identity. Or. Rev. Stat. § 431A.860. Approximately 700,000 prescription records are uploaded to the system annually.

Under Oregon law, prescription monitoring information submitted to the PDMP constitutes "protected health information" and is not subject to disclosure except in limited circumstances. Or. Rev. Stat. § 431A.865(1). For instance, practitioners and pharmacists may obtain prescription monitoring information where "the requested information is for the purpose of evaluating the need for or providing medical or pharmaceutical treatment for a patient to whom the practitioner or pharmacist anticipates providing, is providing or has provided care." Id. § 431A.865(2)(a)(A). Oregon law also authorizes the Oregon Health Authority to disclose prescription monitoring information "[p]ursuant to a valid court order based on probable cause and issued at the request of a federal, state or local law enforcement agency engaged in an authorized drug-related investigation involving a person to whom the requested information pertains." Id. § 431A.865(2)(a)(F).

III. Procedural Background

In September 2012, the DEA issued two administrative subpoenas to the PDMP, seeking the records of one patient and two prescribing physicians. Oregon brought a declaratory judgment action in district court, seeking a declaration that "it cannot be compelled to disclose an individual's health information to the DEA pursuant to an administrative subpoena unless ordered by a federal court."2

Intervenors the ACLU Foundation of Oregon, four "John Doe" patients, and Dr. "James Roe," M.D., sought intervention as of right under Federal Rule of Civil Procedure 24(a).3 They brought a claim distinct from Oregon's, namely that the DEA's use of administrative subpoenas violated Intervenors' asserted Fourth Amendment rights in certain private health information. In furtherance of that claim, Intervenors also sought an injunction prohibiting the DEA from obtaining prescription records from the PDMP without securing a warrant supported by probable cause. The district court granted the motion to intervene and Intervenors filed a complaint-inintervention bringing their Fourth Amendment claim, as well as a co-extensive Administrative Procedure Act claim.

On cross-motions for summary judgment, the district court ruled that Intervenors did not need to establish their own standing to bring a Fourth Amendment claim but instead were required only to meet Rule 24(a)'s intervention criteria and to show that the claim was ripe. The district court then held that the DEA's use of administrative subpoenas to obtain PDMP records constituted a Fourth Amendment violation. Reasoning that unconstitutional federal statutes cannot preempt state law, the district court concluded that this finding also resolved the preemption issue, and thus it did not reach the preemption arguments raised by Oregon. The DEA appealed.

Analysis

I. Intervenors and the Standing Requirement

A. Intervenors Must Establish Standing Because They Seek Relief Different from Oregon

The threshold issue in this appeal is whether Intervenors must establish independent standing in order to pursue different relief from that sought by Oregon, the plaintiff. The answer is yes because the relief sought by Oregon is distinct from the relief sought by Intervenors.

After argument in this matter, the Supreme Court decided Town of Chester, which addresses the issue we face here, the requirement of intervenor standing. See Town of Chester, ___ U.S. at ___-___, 137 S.Ct. at 1651. As the Supreme Court did in Town of Chester, it is useful to begin with first principles: "Article III of the Constitution limits the power of federal courts to deciding `cases' and `controversies.'" Diamond v. Charles, 476 U.S. 54, 61, 106 S.Ct. 1697, 90 L.Ed.2d 48 (1986). "[T]he requirement that a claimant have standing is an essential and unchanging part of the case-or-controversy requirement of Article III." Davis v. Fed. Election Comm'n, 554 U.S. 724, 733, 128 S.Ct. 2759, 171 L.Ed.2d 737 (2008) (quoting Lujan v. Defenders of Wildlife, 504 U.S. 555, 560, 112 S.Ct. 2130, 119 L.Ed.2d 351 (1992)) (internal quotation marks omitted). This axiom ensures both that the legal issues presented to the court are sharpened by the presence of concrete adversity and that judicial review is sought by those who have a direct stake in the outcome. Diamond, 476 U.S. at 62, 106 S.Ct. 1697 (citations omitted).

Accordingly, the Supreme Court has counseled that "[s]tanding is not dispensed in gross." Davis, 554 U.S. at 734, 128 S.Ct. 2759 (quoting Lewis v. Casey, 518 U.S. 343, 358 n.6, 116 S.Ct. 2174, 135 L.Ed.2d 606 (1996)). Instead, "the standing inquiry requires careful judicial examination of a complaint's allegations to ascertain whether the particular plaintiff is entitled to an adjudication of the particular claims asserted." Allen v. Wright, 468 U.S. 737, 752, 104 S.Ct. 3315, 82 L.Ed.2d 556 (1984) (emphasis added), abrogated on other grounds by Lexmark Int'l, Inc. v. Static Control Components, Inc., ___ U.S. ___, 134 S.Ct. 1377, 188 L.Ed.2d 392 (2014). In other words, Article III requires "a plaintiff [to] demonstrate standing for each claim he seeks to press and for each form of relief that is sought." Davis, 554 U.S. at 734, 128 S.Ct. 2759 (quoting DaimlerChrysler Corp. v. Cuno, 547 U.S. 332, 352, 126 S.Ct. 1854, 164 L.Ed.2d 589 (2006)) (internal quotation marks omitted).

This ineluctable requirement is not vitiated simply because an intervenor is raising a new or different claim for relief in the context of an existing case rather than bringing an original suit. However, until its decision in Town of Chester, the Court had not addressed the question whether an intervenor "must satisfy not only the requirements of Rule 24(a)(2), but also the requirements of Art[icle] III." Diamond, 476 U.S. at 68-69, 106 S.Ct. 1697; id. at 68 n.21, 106 S.Ct. 1697 (noting the varying conclusions of the Courts of Appeals). After reciting the constitutional foundation for standing analysis, the Court in Town of Chester reiterated that "standing is not dispensed in gross." Town of Chester, ___ U.S. at ___, 137 S.Ct. at 1650 (quoting Davis, 554 U.S. at 734, 128 S.Ct. 2759). The Court went on to explain that "[t]he same principle applies when there are multiple plaintiffs" and "to intervenors of right." Id. at ___-___, 137 S.Ct. at 1651. Put succinctly: "Although the context is different, the rule is the same." Id. at ___, 137 S.Ct. at 1651. The Court stated the rule as follows: "an intervenor of right must have Article III standing in order to pursue relief that is different from that which is sought by a party with standing." Id. This includes when the intervenor "seeks additional relief beyond that which the plaintiff requests." Id.

With the Supreme Court's newly-minted rule in mind, we examine the relief sought here. What Oregon wants is a declaration that — pursuant to Oregon law — a prior court order is required before the DEA can enforce an investigative subpoena. Oregon seeks a declaratory judgment that, because of Or. Rev. Stat. § 431A.865(2)(a)(F), "it cannot be compelled to disclose an individual's protected health information" without a federal court order finding that "the subpoena meets all relevant federal requirements." Oregon "asks this court to find that the Controlled Substances Act does not preempt [§ 431A.865(2)(a)(F)], except as to probable cause." Oregon acknowledges that [§ 431A.865(2)(a)(F)'s probable cause requirement is preempted and disclaims any reliance on the Fourth Amendment. Instead, Oregon's entire basis for relief rests on a state-law procedural argument, namely that the DEA must get a federal court to bless the subpoena before it is issued.

What Intervenors want is something very different — they want declaratory and injunctive relief "prohibiting the DEA from obtaining prescription records from the PDMP without securing a probable cause warrant." Intervenors' claim for relief is founded on the Fourth Amendment and its requirement of probable cause and a warrant. Intervenors explicitly declined to "take a position on the preemption issue" in their complaint-in-intervention. Intervenors do not dispute that they seek relief different from Oregon in the form of a requirement for a warrant supported by probable cause "instead of a subpoena."

The Supreme Court's decision lays to rest Intervenors' argument that they do not need to establish independent Article III standing to bring their Fourth Amendment claim. In accord with Town of Chester, we hold that where, as here, the Intervenors seek to obtain different relief than the original plaintiff, the Intervenors must establish independent Article III standing. The Intervenors have not done so.

B. Intervenors Lack Standing to Bring Their Fourth Amendment Claim

The DEA's two administrative subpoenas seek the records of a single patient and two prescribing physicians, not records related to any of the Intervenors. Intervenors have provided no evidence that the DEA is seeking or will seek any records related to them.4 Like the plaintiffs in the Supreme Court's recent decision in Clapper v. Amnesty International USA, Intervenors' injuries are speculative and fail to qualify as "concrete, particularized, and actual or imminent; fairly traceable to the challenged action; and redressable by a favorable ruling." See 568 U.S. 398, 133 S.Ct. 1138, 1147, 185 L.Ed.2d 264 (2013) (citations omitted). The Supreme Court explained that "[a]lthough imminence is concededly a somewhat elastic concept, it cannot be stretched beyond its purpose, which is to ensure that the alleged injury is not too speculative for Article III purposes...." Id. (quoting Lujan, 504 U.S. at 565 n.2, 112 S.Ct. 2130) (internal quotation marks omitted). Thus, "threatened injury must be certainly impending to constitute injury in fact, and... [a]llegations of possible future injury are not sufficient." Id. (alteration in original) (quoting Whitmore v. Arkansas, 495 U.S. 149, 158, 110 S.Ct. 1717, 109 L.Ed.2d 135 (1990)) (internal quotation marks omitted). In Clapper, the Court found the plaintiffs' theory of injury too speculative because plaintiffs could not provide evidence that their communications with foreign contacts had been or would be monitored by the government. 133 S.Ct. at 1148-50. Likewise, Intervenors are not under an impending threat of disclosure. We see no meaningful distinction between the nature of the claims asserted in Clapper and those here.

Nor can Intervenors establish standing via their fear of disclosure and the preventative measures they took to avoid disclosure. The John Does, who each take Schedule II-IV drugs subject to the CSA, declared that knowing the DEA could obtain their prescription records in the future without a warrant issued in compliance with the Fourth Amendment causes them psychological distress and could change their future behavior in seeking medical treatment. Similarly, Dr. Roe stated that the DEA and FBI previously investigated him in Washington State pursuant to Washington's drug monitoring program. He believes the investigation stemmed from information obtained without a probable cause warrant. Dr. Roe claims that the investigation, as well as the knowledge that he could also be investigated with respect to his Oregon patients, has made him more reluctant to prescribe Schedule II-IV drugs to his patients.

We acknowledge the particularly private nature of the medical information at issue here and thus do not question the seriousness of Intervenors' fear of disclosure. Nor do we imply that this concern is unreasonable. Nevertheless, we are bound by Clapper, which rejected a comparable argument. The Court held that plaintiffs' preventative measures taken out of fear of being surveilled did not establish standing, even if plaintiffs' fear was not unreasonable. As the Court observed,

133 S.Ct. at 1151 (citation omitted). Thus, Intervenors lack standing to bring their Fourth Amendment claim and their related Administrative Procedure Act claim.

II. Federal Preemption Under the Controlled Substances Act

Having addressed Intervenors' claim, we are left with Oregon's claim that its statutory requirement for a court order does not conflict with federal law.

The Supremacy Clause gives Congress "the power to pre-empt state law expressly." Hillman v. Maretta, ___ U.S. ___, 133 S.Ct. 1943, 1949, 186 L.Ed.2d 43 (2013) (citation omitted). Congress did just that in the CSA, which contains an express preemption provision: state law is preempted whenever "there is a positive conflict between [a] provision of th[e CSA] and [a] State law so that the two cannot consistently stand together." 21 U.S.C. § 903. Because this carve-out is an express invocation of conflict preemption, we must determine whether "compliance with both federal and state regulations is a physical impossibility," or the "state law stands as an obstacle to the accomplishment and execution of the full purposes and objectives of Congress." Gade v. Nat'l Solid Wastes Mgmt. Ass'n, 505 U.S. 88, 98, 112 S.Ct. 2374, 120 L.Ed.2d 73 (1992) (internal quotation marks and citations omitted); accord United States v. Zadeh, 820 F.3d 746, 750-52 (5th Cir. 2016) (applying the "obstacle" test to hold that 21 U.S.C. § 876 preempts a provision of the Texas Occupations Code under § 903).

This case doesn't involve a physical impossibility, so instead we ask whether requiring a court order is a "sufficient obstacle" to the operation of 21 U.S.C. § 876. Our analysis of this question is "informed by examining the federal statute as a whole and identifying its purpose and intended effects." Crosby v. Nat'l Foreign Trade Council, 530 U.S. 363, 373, 120 S.Ct. 2288, 147 L.Ed.2d 352 (2000). Here, Congress enacted the CSA in part to "strengthen law enforcement tools against the traffic in illicit drugs." Gonzales, 545 U.S. at 10, 125 S.Ct. 2195. The upshot of the statutory scheme is that the Attorney General can obtain testimony and documents through a subpoena and without a court order. See 21 U.S.C. § 876(a). A court order is needed only in the event of noncompliance ("contumacy ... or refusal to obey") with the subpoena. Id. § 876(c).

Before disclosure of information, Oregon law interposes a significant obstacle — "a valid court order" in all cases in which a subpoena is issued. Or. Rev. Stat. § 431A.865(2)(a)(F). The statute provides that the Oregon Health Authority "shall disclose [prescription monitoring] information," id. § 431A.865(2)(a), "[p]ursuant to a valid court order based on probable cause and issued at the request of a federal, state or local law enforcement agency engaged in an authorized drug-related investigation involving a person to whom the requested information pertains," id. § 431A.865(2)(a)(F).

Oregon concedes that the probable cause requirement is preempted by federal law. Oregon states, however, that the "PDMP is required to wait for judicial review and a court order before it c[an] turn over the records."

Even assuming that the probable cause requirement is severable, the Oregon statute stands as an obstacle to the full implementation of the CSA because it "interferes with the methods by which the federal statute was designed to reach [its] goal." Gade, 505 U.S. at 103, 112 S.Ct. 2374 (quoting Int'l Paper Co. v. Ouellette, 479 U.S. 481, 494, 107 S.Ct. 805, 93 L.Ed.2d 883 (1987)). By placing the initial burden of requiring a court order to enforce the subpoena upon the DEA, § 431A.865 interferes with the scheme Congress put in place for the federal investigation of drug crimes and thereby undermines Congress's goal of "strengthen[ing] law enforcement tools against the traffic in illicit drugs." Gonzales, 545 U.S. at 10, 125 S.Ct. 2195. Consequently, we hold that the two provisions are in "positive conflict" — Or. Rev. Stat. § 431A.865 is preempted by 21 U.S.C. § 876. We note, however, that this result preserves Oregon's option to contest subpoenas for protected information and thus trigger the enforcement procedure described in § 876(c), a critical safeguard in light of the particularly important privacy interest implicated here.

REVERSED.