United States v. Robert McLamb
880 F.3d 685
4th Cir.2018Background
- Playpen was a Tor hidden-service message board distributing child pornography; FBI seized its server and arrested its administrator.
- FBI sought and obtained a 30-day warrant from an Eastern District of Virginia magistrate to deploy a Network Investigative Technique (NIT) on Playpen visitors; the NIT delivered code that extracted identifying data (IP, MAC, hostnames, etc.) from visiting computers.
- Appellant McLamb accessed Playpen, triggered the NIT, and the NIT identified his computer; FBI then obtained a second warrant to search his home and seized a hard drive containing child pornography.
- McLamb moved to suppress the evidence, arguing the NIT warrant (and its execution) lacked particularity, exceeded the magistrate’s jurisdiction, and was otherwise defective.
- The district court denied suppression; McLamb entered a conditional guilty plea and appealed the denial. The Fourth Circuit affirmed, holding that even if the warrant were unconstitutional, the Leon good-faith exception barred suppression.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Particularity / scope of warrant | Warrant was vague and misidentified search location (EDVA) though NIT searched computers worldwide | Affidavit described Tor, Playpen, and NIT mechanics; magistrate was informed NIT would collect from "wherever located" | Warrant facially sufficient for good-faith reliance; officers could reasonably presume validity |
| Magistrate jurisdiction (Rule 41) | Warrant exceeded magistrate's authority because it authorized remote searches of computers nationwide | Boundaries were unclear at the time; DOJ and FBI counsel were consulted before seeking warrant | Unclear law does not make warrant so deficient as to preclude Leon good-faith exception |
| Execution of warrant / misrepresentation | Affiant misled magistrate by identifying EDVA as location and by how NIT operated | Agent disclosed server location and explained NIT would cause remote machines to transmit data; form limitations cured by affidavit | No evidence of intentional falsehoods or reckless disregard; affidavit sufficiently described NIT |
| Remedy — exclusionary rule applicability | Any constitutional violation requires suppression; warrants exceeding jurisdiction are void and should lead to suppression | Exclusionary rule deters police misconduct; suppressing here would not effect appreciable deterrence; Leon governs | Suppression denied under Leon; good-faith exception applies even if warrant was unconstitutional |
Key Cases Cited
- United States v. Leon, 468 U.S. 897 (Sup. Ct. 1984) (establishes good-faith exception to exclusionary rule)
- Herring v. United States, 555 U.S. 135 (2009) (exclusionary rule aims to deter police misconduct and requires appreciable deterrence)
- Illinois v. Krull, 480 U.S. 340 (1987) (suppression focuses on culpability of law enforcement, not judicial errors)
- United States v. Horton, 863 F.3d 1041 (8th Cir. 2017) (addressing same Playpen/NIT warrant; applied Leon to deny suppression)
- United States v. Levin, 874 F.3d 316 (1st Cir. 2017) (same NIT warrant; Leon good-faith exception prevented suppression)
- United States v. Workman, 863 F.3d 1313 (10th Cir. 2017) (same NIT warrant; affirmed denial of suppression under Leon)