922 F.3d 1079
10th Cir.2019Background
- In 2015 the FBI seized and operated the Tor-hidden child‑pornography site “Playpen,” deploying a Network Investigative Technique (NIT) from a government server in the Eastern District of Virginia to identify users by causing visiting computers to transmit identifying data (including IP addresses) to the FBI.
- A magistrate judge in the Eastern District of Virginia issued the NIT warrant; the NIT ran for ~two weeks and identified the user "shishkabobs," whose IP traced to Daniel Cookson’s home in Kansas; a subsequent search uncovered child pornography and Cookson later confessed.
- Cookson moved to suppress evidence derived from the NIT, arguing the issuing magistrate lacked authority under the Federal Magistrates Act and Federal Rule of Criminal Procedure 41(b) to authorize a search outside her district; the district court denied suppression, applying the good‑faith exception and relying on Tenth Circuit precedent in United States v. Workman.
- Cookson pleaded guilty to two counts of possession of child pornography under a conditional plea preserving the suppression issue; PSR computed a Guidelines range of 97–121 months (offense level 28, CHC III).
- At sentencing the district court initially announced an intent to impose 72 months’ imprisonment, heard argument and allocution, then imposed five years’ probation — citing Cookson’s rehabilitation, employment, family support, an overrepresented criminal history, and policy disagreement with Sentencing Guideline §2G2.2.
- The government appealed the probationary sentence as substantively unreasonable; Cookson cross‑appealed the denial of suppression. The Tenth Circuit affirmed suppression but vacated the sentence and remanded for resentencing.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Whether evidence from the NIT should be suppressed because the issuing magistrate lacked authority under Rule 41(b) and the Federal Magistrates Act | Cookson: the Virginia magistrate exceeded territorial authority; NIT warrant was invalid and exclusionary rule should apply because good‑faith exceptions do not apply given alleged government misconduct/knowledge | Government: even if the warrant was invalid, agents reasonably relied on the magistrate’s warrant and the good‑faith exception (Leon) saves the evidence; Workman controls | Affirmed denial of suppression; applying Workman, the court held agents acted in objectively reasonable good faith, so evidence admissible |
| Whether the five‑year probation sentence is substantively reasonable under 18 U.S.C. §3553(a) | Government: sentence is substantively unreasonable given Guidelines (97–121 months), seriousness of offense, deterrence, risk of disparity; district court’s explanation was insufficient or premised on misunderstanding | Cookson: emphasized rehabilitation, employment, over‑represented criminal history, and policy disagreement with §2G2.2 to justify a significant downward variance to probation | Vacated and remanded for resentencing; court concluded the large downward variance was substantively unreasonable because the district court relied nearly exclusively on rehabilitation, misunderstood the plea agreement, and provided an inadequate explanation for the variance |
Key Cases Cited
- United States v. Workman, 863 F.3d 1313 (10th Cir. 2017) (applied good‑faith exception to same Playpen NIT warrant)
- United States v. Leon, 468 U.S. 897 (1984) (established good‑faith exception to the exclusionary rule)
- Davis v. United States, 564 U.S. 229 (2011) (clarified when Leon's good‑faith exception applies)
- Gall v. United States, 552 U.S. 38 (2007) (procedural and substantive reasonableness standards for sentencing review)
- United States v. Walker, 844 F.3d 1253 (10th Cir. 2017) (cautioned against overreliance on a single sentencing factor; reversed when district court focused almost exclusively on one mitigating factor)
- United States v. DeRusse, 859 F.3d 1232 (10th Cir. 2017) (example of affirming a large downward variance where court thoughtfully addressed all §3553(a) factors)