What is the duty of the neutral and detached magistrate? It’s explained in In re A Search of A Certain Apple iCloud Acct., 2026 WL 2534328, 2026 U.S. Dist. LEXIS 193213 (W.D. Tex. Aug. 27, 2026):
I have, over the past more than eight years, experienced common misconceptions surrounding search warrant and other similar requests for ex parte criminal process. Without necessarily attributing any particular statement to any participant or party, some of the more notable of those misconceptions are:
- The plain language of Federal Rule of Criminal Procedure permits the denial of a warrant application only for absence of probable cause.
- Rule 41 mandates issuance of a warrant upon a showing of probable cause.
- The submission, by a party requesting a warrant or similar process, of a draft order that seeks relief that is narrower than the authority sought in an associated application can never be grounds for denial of the warrant.
- Where probable cause has been established, it is improper to deny a warrant application if a Magistrate Judge can instead narrow the scope of the warrant by simple interlineation without denying the warrant altogether.
- Some or perhaps all of the Magistrate Judges in San Antonio require the submission of error-free applications for legal process as a prerequisite to approval.
- The constitutional principle of Separation of Powers does not permit a Magistrate Judge to request supervisory review as a prerequisite to submission and approval of warrant applications. This is so even if the requirement is imposed temporarily and in response to the repeated submission of mistake-ridden, incorrect, internally inconsistent, or otherwise defective submissions.
Concerned that these misconceptions might create, at best, a significant misunderstanding between the USAO, the defense bar, and the Magistrate Judges, or at worst lead to conflicts about the role of Magistrate Judges and the law governing search warrants and other ex parte criminal process, I provide this Order to make my positions on these issues a matter of public record.
A Magistrate Judge does not merely assess probable cause. Although probable cause is a necessary condition for issuance of a search warrant, the existence of probable cause is insufficient on its own to justify issuance of a search warrant. E.g., Groh v. Ramirez, 540 U.S. 551, 557 (2004) (finding warrant “plainly invalid” even though supported by probable cause because it failed to satisfy the Constitution’s particularity requirement).
One need look no further than the text of the Fourth Amendment to understand that single-minded focus on probable cause is misplaced. Reasonableness, probable cause, and particularity are all foundational prerequisites for a search warrant:
The text of the [Fourth] Amendment [ ] expressly imposes two requirements. First, all searches and seizures must be reasonable. Second, a warrant may not be issued unless probable cause is properly established and the scope of the authorized search is set out with particularity.
Kentucky v. King, 563 U.S. 452, 459 (2011) (emphasis added and citation omitted). …
Particularity and Overbreadth. Search warrants must be specific. Two prongs comprise specificity: particularity and breadth. …
Reasonableness. A search must be reasonable. And an assessment of a search’s reasonableness occurs by the Magistrate Judge before a search is authorized. …
Jurisdiction. Of course, there must be jurisdiction. Every submission must establish the Court’s jurisdiction. Warrant applications and other process can be, and not infrequently are, denied on this basis. …
A Magistrate Judge is not a rubber stamp. The Constitution interposes the Magistrate Judge into criminal investigative proceedings by design, and it does so specifically to prevent Government overreach:
Absent some grave emergency, the Fourth Amendment has interposed a magistrate [judge] between the citizen and the police. This was done not to shield criminals nor to make the home a safe haven for illegal activities. It was done so that an objective mind might weigh the need to invade that privacy in order to enforce the law. The right of privacy was deemed too precious to entrust to the discretion of those whose job is the detection of crime and the arrest of criminals. Power is a heady thing; and history shows that the police acting on their own cannot be trusted.
McDonald, 335 U.S. at 455-56 (emphasis added). A Magistrate Judge fails by merely rubber-stamping warrant requests, because by doing so the Judge becomes a de facto prosecutor: …
A Magistrate Judge is under no obligation to explain a warrant denial. A Magistrate Judge’s reluctance to detail why a warrant application or other submission is rejected stems from a concern that the Judge is not a prosecutor and must never been seen to act as one. See id. Likewise, an explanation that a submission is rejected for one reason doesn’t guarantee that there aren’t other reasons to further reject it. Nor is a Magistrate Judge obligated to provide any explanation, let alone every possible explanation, for a rejection. It is within each Judge’s discretion to provide an explanation at all, let alone to discuss multiple grounds for a rejection. Any suggestion to the contrary is in error, and binding case law does not support it.
Some warrant interactions are ex parte and others need to be on the record. Magistrate Judges have authority to administratively deny ex parte requests and allow resubmission. What this approach gains in efficiency it threatens to lose in transparency. …
Credibility. The Fourth Amendment requires that the affiant attesting to facts in support of a warrant application be credible and reliable: …
Magistrate Judges can and do routinely impose procedural requirements on warrant submissions and reject submissions on procedural grounds. There can be no meaningful debate that a Magistrate Judge has the authority to impose necessary procedural requirements in connection with search warrants and other ex parte submissions. …
An appeal under 28 U.S.C. § 636(b)(1) is not the appropriate means to challenge the denial of a warrant application. …
If the USAO seeks the relief discussed in the previous paragraph, it should also provide notice to the Magistrate Judge. This would mirror the requirements of a mandamus petition by also providing the Magistrate Judge with notice of the resubmission. Notice should also be given when submitting or resubmitting a search warrant application directly to the District Judge, as it would circumvent well-established local procedures. Indeed, a Magistrate Judge who previously denied a warrant but then learned only through the grapevine of a resubmission to a District Judge would likely have more to say on the topic. The Magistrate Judge would have even more to say if the resubmission to another Judge didn’t fully and accurately relate the circumstances of the prior denial. So would the District Judge, one suspects.
