Unreported / Non-Citable
Background
Frank Sepulveda is a California state prisoner currently incarcerated at the California Substance Abuse Treatment Facility. On March 11, 2026, he filed a petition for a writ of habeas corpus in the United States District Court for the Northern District of California, challenging a U.S. Immigration and Customs Enforcement detainer and stating that he was 'petitioning to stop and remove all holds detainers, deportations and extraction.' The petition was transferred to the Eastern District of California on March 24, 2026.
That same day, the respondents — the Field Office Director of the San Francisco Field Office of ICE and others — filed a motion to dismiss the petition for lack of jurisdiction for failure to name a proper respondent. On April 30, 2026, the court ordered Sepulveda to show cause within thirty days why the petition should not be dismissed for lack of jurisdiction. No response was filed, and the time for doing so passed. The court also gave Sepulveda an opportunity to clarify whether he was in fact challenging his criminal conviction, but he never responded.
The Court’s Holding
Magistrate Judge Stanley A. Boone concluded that the court lacks jurisdiction over the habeas petition. The federal habeas statute, 28 U.S.C. § 2241(c)(1), (3), permits a district court to entertain a habeas application only from a person 'in custody under or by color of the authority of the United States' or 'in custody in violation of the Constitution or laws or treaties of the United States.' An immigration detainer under 8 C.F.R. § 287.7 is merely a request that another law enforcement agency advise the Department of Homeland Security before releasing a prisoner so federal authorities can arrange to assume custody. Citing Ninth Circuit precedent, the court noted that 'the bare detainer letter alone does not sufficiently place an alien in INS custody to make habeas corpus available.' Because Sepulveda is not currently in the custody of the Department of Homeland Security, the court lacks jurisdiction over a habeas petition challenging the detainer.
The court further concluded that, to the extent Sepulveda was attempting to preemptively litigate a future removal proceeding, the court lacks jurisdiction to address those claims. Under 8 U.S.C. § 1252(a)(5), a petition for review filed with an appropriate court of appeals is the sole and exclusive means for judicial review of an order of removal; § 1252(b)(9) makes judicial review of removal-related questions available only in review of a final order of removal; and § 1252(g) bars courts from hearing any cause or claim arising from the Attorney General's decision or action to commence proceedings, adjudicate cases, or execute removal orders.
Accordingly, the court recommended — rather than ordered — that the petition for writ of habeas corpus be dismissed for lack of jurisdiction and that the respondents' motion to dismiss be terminated as moot. The Findings and Recommendation were submitted to the assigned district judge under 28 U.S.C. § 636(b)(1)(B), with any written objections due within fourteen days of service.
Key Takeaways
- An immigration detainer by itself does not place a state prisoner in federal custody for purposes of habeas corpus jurisdiction under 28 U.S.C. § 2241.
- A prisoner who is not in the custody of the Department of Homeland Security cannot use a federal habeas petition to challenge an ICE detainer.
- Challenges to future or anticipated removal orders must be raised through a petition for review in the court of appeals after a final order of removal, not through a district court habeas petition.
- A petitioner who fails to respond to a court order to show cause risks a recommendation of dismissal on jurisdictional grounds.
- A magistrate judge's findings and recommendation are not a final order; parties have fourteen days to object, and failure to object may waive the right to appeal the district court's eventual order.
Why It Matters
This recommendation reinforces the established Ninth Circuit rule that an immigration detainer alone does not satisfy the custody requirement for federal habeas jurisdiction. State prisoners who seek to challenge ICE detainers must wait until they are actually in federal custody or pursue other available remedies.
The decision also underscores the jurisdictional limits imposed by 8 U.S.C. § 1252, which channels judicial review of removal-related claims into the courts of appeals and bars district courts from entertaining preemptive challenges to future removal proceedings.