United States v. Bryan Henderson
906 F.3d 1109
9th Cir.
2018

Background

  • In 2014 the FBI seized Playpen, a Tor hidden-service child‑pornography site, and then operated it from a government server in the Eastern District of Virginia to investigate users.
  • The FBI obtained an Eastern District of Virginia warrant (a “NIT warrant”) authorizing deployment of a Network Investigative Technique (NIT) to deliver code to any user who logged into Playpen; the NIT caused activating computers to send identifying data (including IP addresses) to the Virginia server.
  • The NIT identified an IP address tied to a computer in San Mateo, California; a Northern District of California magistrate issued a search warrant for that residence, leading to evidence of child pornography on Henderson’s computer.
  • Henderson was indicted in the Northern District of California, moved to suppress evidence obtained via the Eastern District of Virginia NIT warrant, pled guilty while reserving the suppression appeal, and was sentenced.
  • The Ninth Circuit held the NIT warrant violated the territorial limits of Fed. R. Crim. P. 41(b) (and thus the magistrate’s statutory authority under 28 U.S.C. § 636), but assessed whether suppression was required under the Fourth Amendment and the Leon good‑faith exception.

Issues

Issue Plaintiff's Argument (Henderson) Defendant's Argument (Gov’t) Held
Whether the NIT warrant exceeded magistrate’s territorial authority under Rule 41(b) Warrant unlawfully authorized searches of computers outside issuing district Rule 41(b)(4) tracking‑device provision or other authority authorizes the warrant Held: Warrant violated Rule 41(b); NIT is not a “tracking device” within Rule 41(b)(4)
Whether the Rule 41(b) violation is a fundamental (constitutional) error Violation rendered the warrant void ab initio and thus violated the Fourth Amendment Rule 41 is a procedural/venue rule not implicating the Fourth Amendment Held: Violation was fundamental; warrant void ab initio and implicated the Fourth Amendment
Whether the Leon good‑faith exception precludes suppression of evidence obtained under the void warrant Good‑faith exception should not apply to a warrant void ab initio; suppression required to deter Executing officers reasonably relied on a magistrate warrant; Leon applies to void warrants if reliance is objectively reasonable Held: Good‑faith exception applies; officers reasonably relied on the warrant, so suppression is barred
Whether suppression would serve deterrence given Rule 41’s later amendment Suppression necessary to deter magistrate/judicial overreach Little deterrent value because officers acted reasonably and Rule 41 was later amended to authorize similar warrants Held: Suppression would not meaningfully deter; Rule 41(b)(6) later authorizes such methods, reinforcing application of good‑faith exception

Key Cases Cited

  • United States v. Leon, 468 U.S. 897 (Sup. Ct.) (establishes good‑faith exception to exclusionary rule)
  • Herring v. United States, 555 U.S. 135 (Sup. Ct.) (exclusionary rule applies only where deterrence justifies costs)
  • United States v. Jones, 565 U.S. 400 (Sup. Ct.) (original public meaning of Fourth Amendment informs scope of protections)
  • United States v. Krueger, 809 F.3d 1109 (10th Cir.) (warrant beyond magistrate’s territorial authority is void ab initio; territorial limits on magistrates)
  • United States v. Werdene, 883 F.3d 204 (3d Cir.) (NIT warrant void ab initio under § 636 and Rule 41; good faith analysis)
  • United States v. Horton, 863 F.3d 1041 (8th Cir.) (NIT warrant invalid and treated as warrantless search; good‑faith considerations)
  • United States v. Negrete‑Gonzales, 966 F.2d 1277 (9th Cir.) (distinguishes fundamental vs. technical Rule 41 errors for suppression analysis)
  • United States v. McLamb, 880 F.3d 685 (4th Cir.) (addressing NIT warrants and suppression)
  • United States v. Levin, 874 F.3d 316 (1st Cir.) (NIT warrant challenges and good‑faith outcome)
  • United States v. Workman, 863 F.3d 1313 (10th Cir.) (denial of suppression under Leon for NIT‑based evidence)
  • Arizona v. Evans, 514 U.S. 1 (Sup. Ct.) (good‑faith reliance on erroneous court record can preclude suppression)
  • United States v. Forrester, 512 F.3d 500 (9th Cir.) (IP address as identifying characteristic of a computer)
  • United States v. Luong, 470 F.3d 898 (9th Cir.) (facial deficiency standard for warrants under Leon)
  • NLRB v. A‑Plus Roofing, 39 F.3d 1410 (9th Cir.) (magistrates are creatures of statute; jurisdictional limits on magistrate authority)
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