ORDER

LEE H. ROSENTHAL, Chief District Judge.

Jaime Piero Cole, an inmate on Texas death row, has filed a federal petition for a writ of habeas corpus. (Docket Entry No. 10). Cole moves for discovery to develop claims in his habeas petition. (Docket Entry No. 15). The respondent, Lorie Davis, opposes any discovery. (Docket Entry No. 23). For the reasons discussed below, the court determines that discovery would be premature at this time, and the motion is denied.

I. Background

In 2012, a Texas jury convicted Cole of capital murder for killing his estranged wife and his 15-year-old stepdaughter. After an unsuccessful state direct appeal and habeas corpus application, Cole filed his federal petition for a writ of habeas corpus on February 6, 2018. (Docket Entry No. 10). Cole's federal petition raises 15 grounds for relief. They include that trial counsel provided ineffective representation by not presenting testimony about his Cole's history of trauma (claim one); not securing expert assistance (claim two); and not presenting evidence of exposure to neurotoxins and resultant brain damage (claim three). Other grounds are that trial counsel should have objected to the State's use of peremptory strikes to remove minority prospective jurors (claim five), and his death sentence is unconstitutional because Texas arbitrarily administers capital punishment (claim fourteen). Cole exhausted claims one, two, five, and fourteen in state court, but he raises claim three for the first time in his federal habeas corpus petition.

The parties submitted a joint proposed scheduling order with a deadline for Cole to amend his habeas petition. (Docket Entry Nos. 11, 12). Cole subsequently filed this motion for discovery. (Docket Entry No. 15). The court granted the parties' joint motion to stay the time to amend Cole's petition until the discovery motion was resolved. (Docket Entry No. 19).

Cole asks this court to "grant discovery to enable [him] to prove his allegations, which when proven will entitle him to relief." (Docket Entry No. 15). Cole's discovery motion includes the following requests:

The respondent opposes the discovery Cole requests. (Docket Entry No. 23). The respondent contends that the Anti-Terrorism and Effective Death Penalty ("AEDPA") precludes consideration of factual material developed for the first time in the federal habeas court. The respondent also argues that Cole's second discovery request should be denied because he did not exhaust the underlying claim in state court. Cole has filed a reply. (Docket Entry No. 28).1

II. The Discovery Standard

III. The Timing of Discovery

This case is still in the pleading stage of the federal habeas process. Cole has filed a federal habeas petition, and the court has granted him leave to amend. Discovery is tied to the pleadings, particularly in habeas litigation, which does not allow discovery as an investigative tool to identify habeas claims. See Brian R. Means, FEDERAL HABEAS MANUAL § 6:10 (2017) ("Federal district courts do not have authority to order prepetition discovery in habeas cases, including capital cases."); Advisory Committee Notes to Rule 6 ("[R]equests for discovery in habeas proceedings normally follow the granting of an evidentiary hearing . . . ."); see also Lonchar v. Thomas, 517 U.S. 314, 326 (1996) (discovery is available "once an answer has been ordered"). The Advisory Committee Notes to Rule 6 observe that "there may be instances in which discovery would be appropriate" before an evidentiary hearing, but the purpose of any "pre-hearing discovery [would be to] show an evidentiary hearing to be unnecessary . . . ." See also Blackledge v. Allison, 431 U.S. 63, 81 (1997) (including discovery among "a variety of measures in an effort to avoid the need for an evidentiary hearing"); East v. Scott, 55 F.3d 996, 1000-01 (5th Cir. 1995) (discovery is a means of deciding whether an evidentiary hearing is not necessary).3

Cole has not identified authority designating discovery as a tool for preparing (or in this case, amending) a federal habeas petition. Cole asks for discovery "to prove his allegations, which when proven will entitle him to relief." (Docket Entry No. 15 at 1). At the pleadings stage, the federal habeas rules require a petitioner to state the grounds for relief, not allege all the evidence supporting it.4 Extensive discovery early in habeas litigation precludes an accurate evaluation of what an inmate must show to obtain relief, if habeas review is available. See Bracy, 520 U.S. at 904 (recognizing the need to "identify the `essential elements' of [a] claim" before "addressing whether [a] petitioner is entitled to discovery" under Rule 6); Calderon v. U.S. Dist. Court for the Northern Dist. of California, 98 F.3d 1102, 1106 (9th Cir. 1996) ("[A] prisoner must outline factual allegations in a petition before the district court will be able to determine the propriety of discovery. . . ."); Mayberry v. Petsock, 821 F.2d 179, 185 (3rd Cir. 1987) ("Unless the petition itself passes scrutiny, there would be no basis to require the state to respond to discovery requests."). Until Cole files his amended petition, and the respondent answers, the court will not have sufficient information to decide whether an evidentiary hearing is necessary or whether there is good cause for additional factual development of Cole's claims. The discovery that Cole seeks is premature at this stage.

IV. Discovery and Limitations on Habeas Review

The respondent raises two other concerns that support finding it premature to consider the need for additional factual development through the discovery Cole seeks. First, the respondent contends that as to the claims Cole has exhausted, this federal court cannot consider evidence that was not before the state courts. Second, the respondent argues that discovery is not available for the claims that Cole has not presented to the state courts.

A. Discovery Requests One, Three, and Four: The Exhausted Claims

Cole argues that the information he obtains from his first, third, and fourth discovery requests will support the habeas claims he exhausted in state court.5 Because the state court "adjudicated [those claims] on the merits," AEDPA requires Cole to show that the state decision was "contrary to, or an unreasonable application of, federal law" under 28 U.S.C. § 2254(d)(1). In Cullen v. Pinholster, 563 U.S. 170 (2011), the Supreme Court held that a federal court's AEDPA review may look only at the facts developed in state court. Pinholster held that "evidence introduced in federal court has no bearing on § 2254(d)(1) review . . . ." 563 U.S. at 185; see also Williams v. Thaler, 684 F.3d 597, 603 (5th Cir. 2012).

Pinholster explicitly addressed a federal court's consideration of new facts, but did not clarify whether AEDPA also confined a federal habeas petitioner's development of new facts. Federal precedent has used Pinholster to limit the federal habeas court's ability to develop new facts in the federal habeas process. The Fifth Circuit relies on Pinholster as an additional limit on federal habeas evidentiary hearings, see Evans v. Davis, 875 F.3d 210, 217 n.5 (5th Cir. 2017); Allen v. Vannoy, 659 F. App'x 792, 810 (5th Cir. 2016); Blue v. Thaler, 665 F.3d 647, 656 (5th Cir. 2011), and on requests for expert or investigative assistance, see Mamou v. Davis, ___ F.App'x ___, 2018 WL 3492821, at *4 n.3(5th Cir. 2018); Devoe v. Davis, 717 F. App'x 419, 431 (5th Cir. 2018).6 The Fifth Circuit has not addressed whether Pinholster limits discovery. The logic behind limiting factual development through evidentiary hearings and funding, however, applies with equal force to discovery requests. See Soffar v. Stephens, 2014 WL 12642575, at *2 (S.D. Tex. 2014) ("Presumably, good cause cannot exist for discovery that would result in evidence a court cannot consider.").

Pinhoslter did not bar all new federal habeas factual development. An evidentiary hearing may be available "where § 2254(d)(1) does not bar federal habeas relief," either because the claims "were not adjudicated on the merits in state court," Pinholster, 563 U.S. at 185, or "the state habeas court unreasonably applied federal law[.]" Evans, 875 F.3d at 217 n.5; see also Allen, 659 F. App'x at 810; Smith v. Cain, 708 F.3d 628, 635 (5th Cir. 2013). But, the Fifth Circuit's interpretation of Pinholster suggests that the better practice is first to decide whether an inmate has exhausted a claim in state court and whether he has met the requirements of § 2254(d)(1) before applying traditional standards to decide whether discovery is appropriate.7

With that understanding, Pinholster does not completely foreclose the discovery Cole seeks relevant to his exhausted claims. If Cole can meet § 2254(d)'s requirements, factual development may be appropriate. See Smith v. Cain, 708 F.3d 628, 634-35 (5th Cir. 2013) (allowing factual development through an evidentiary hearing when an inmate had met the § 2254(d)(1) standard). At this preliminary step of habeas corpus review, however, it is premature to decide whether Cole has shown that any state court decision was contrary to, or an unreasonable application of, federal law.

B. Discovery Request Two: Unexhausted Claims

Cole argues that his second discovery request will provide information supporting his argument that trial counsel provided ineffective assistance on his exposure to neurotoxins (claim three). He did not exhaust this claim in state court. Federal habeas relief is available only if an inmate has "exhausted the remedies available in the courts of the State." 28 U.S.C. § 2254(b)(1)(A). Cole's failure to exhaust his third claim results in a federal procedural bar. See Keeney v. Tamayo-Reyes, 504 U.S. 1, 9-10 (1992) (an unexhausted claim is procedurally defaulted for federal habeas purposes if the claim would now be procedurally barred by state court); Coleman v. Thompson, 501 U.S. 722, 735 n.1 (1991) (same).

A petitioner cannot show good cause for discovery on a claim in a federal court if procedural impediments preclude considering the merits of that claim. See Rucker v. Norris, 563 F.3d 766, 771 (8th Cir. 2009); Williams v. Bagley, 380 F.3d 932, 975 (6th Cir. 2004); Campbell v. Dretke, 117 F. App'x 946, 959 (5th Cir. 2004); Royal v. Taylor, 188 F.3d 239, 249 (4th Cir. 1999); Calderon, 144 F.3d at 621; In re Pruett, 133 F.3d 275, 277 n.1 (4th Cir. 1997); see also Thompson v. Stephens, 2014 WL 2765666, at *2 (S.D. Tex. 2014) ("As a threshold matter, however, a court must also take into account the procedural posture of an inmate's claims. A petitioner cannot show good cause if a federal court cannot reach the merits of the disputed claims."). A petitioner cannot "demonstrate that he is entitled to relief" when procedural impediments prevent full federal review. Bracy, 520 U.S. at 908-09.

A federal procedural bar can be overcome. This court could reach the merits of claim three if Cole can show cause for the default and that actual prejudice has resulted. See Coleman, 501 U.S. at 750. But it is premature at this stage to find that federal review is available on claim three. The parties must brief the procedural concerns and substantive importance of claim three before Cole has shown that he can overcome the procedural bar. Cole's second discovery request is also premature.

V. Conclusion

For the reasons discussed above, the court denies Coles's discovery request without prejudice. Cole may reurge his discovery motion, if necessary, after Respondent has filed an answer in this case.

Under the parties' agreed scheduling order (Docket Entry No. 19), Cole will amend his petition within 84 days after this order is entered, or by February 6, 2019. The respondent will file an answer within 90 days after the amended petition is filed, or by May 7, 2019. Cole may file any reply 60 days after that, or by July 6, 2019.