United States v. Gabriel Werdene, 883 F.3d 204

Background

Playpen was a large dark-web forum hosted on Tor that distributed child pornography; FBI seized the server, operated it from E.D. Va., and deployed a Network Investigative Technique (NIT) malware to identify users.
The NIT silently executed on "activating computers" (users who logged in) and returned seven identifying data points (including IP address) to an FBI-controlled server in E.D. Va.
The magistrate judge in the Eastern District of Virginia issued a single warrant authorizing deployment of the NIT to activating computers "wherever located."
Gabriel Werdene (Pa. resident) was identified via NIT data; FBI later executed a local warrant in E.D. Pa. and seized child pornography; Werdene moved to suppress arguing Rule 41(b) and Fourth Amendment violations.
The district court found the NIT warrant violated then-existing Rule 41(b) but held the NIT was not a Fourth Amendment search; it denied suppression on harmless/technical-error grounds; the government conceded a Fourth Amendment search on appeal.
The Third Circuit held the NIT warrant violated Rule 41(b) and exceeded the magistrate judge's §636(a) authority (void ab initio), but applied the Leon good-faith exception to affirm denial of suppression.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether the NIT warrant complied with Rule 41(b) territorial limits	Werdene: single EDVA warrant could not authorize searches of computers outside that district	Gov: NIT is a tracking device authorized under Rule 41(b)(4) or Rule 41 should be read flexibly to cover NIT	Court: Warrant violated Rule 41(b); NIT is not a "tracking device" under (b)(4) and the Rule did not authorize this cross-district search
Whether the magistrate exceeded authority under the Federal Magistrates Act, rendering the warrant void	Werdene: magistrate lacked geographic jurisdiction under §636(a) so warrant is void ab initio	Gov: Fourth Amendment requirements (probable cause, particularity, neutral magistrate) were met; Rule 41 is procedural	Held: Magistrate exceeded §636(a) limits; warrant void ab initio and of constitutional magnitude
Whether the NIT deployment constituted a Fourth Amendment search	Werdene: NIT searched and seized identifying data from home computer; reasonable expectation of privacy	Gov (on appeal conceded): NIT was a search (district court had erred)	Held: Deployment was a Fourth Amendment search; district court error acknowledged
Whether exclusionary rule requires suppression despite void warrant (good-faith exception)	Werdene: good-faith should not apply to warrants void ab initio; magistrate lacking authority makes warrant incurably invalid	Gov: Officers reasonably relied on a warrant issued by a magistrate; good-faith exception applies; suppression not required	Held: Good-faith exception applies to warrants void ab initio here; no suppression because officers reasonably relied and deterrence is minimal (Rule amended later)

Key Cases Cited

Dalia v. United States, 441 U.S. 238 (1979) (warrant constitutional requirements: probable cause, particularity, neutral magistrate)
United States v. Leon, 468 U.S. 897 (1984) (good-faith exception to exclusionary rule)
United States v. Jones, 565 U.S. 400 (2012) (GPS/search and expectation-of-privacy context; tracking device analogy)
Herring v. United States, 555 U.S. 135 (2009) (exclusionary rule deterrence focus)
Krueger v. United States, 809 F.3d 1109 (10th Cir. 2015) (magistrate territorial power and historical understanding)
United States v. Horton, 863 F.3d 1041 (8th Cir. 2017) (rejected Rule 41(b)(4) tracking-device justification for NIT warrants)
United States v. Master, 614 F.3d 236 (6th Cir. 2010) (warrant signed by one lacking authority is void ab initio)
United States v. Katzin, 769 F.3d 163 (3d Cir. 2014) (application of good-faith inquiry and balancing deterrence costs)
United States v. Pavulak, 700 F.3d 651 (3d Cir. 2012) (circumstances where reliance on a warrant is unreasonable; four exceptions)