590 F.Supp.3d 901
E.D. Va.2022Background
- May 20, 2019 bank robbery in Midlothian, VA; suspect held a phone to his ear during the robbery and fled on foot. Detective Hylton sought a geofence warrant to obtain Google Location History data for a 150-meter radius (17.5 acres) covering 4:20–5:20 p.m. the day of the robbery.
- Google produced Location History (Sensorvault) data in a three‑step protocol: (1) de‑identified device points within the geofence (Step 1); (2) expanded, de‑identified location traces outside the geofence if requested (Step 2); (3) account‑identifying subscriber info upon government request (Step 3).
- Google returned 19 device IDs and 210 location points for Step 1. Hylton later requested Step 2 and Step 3 data for subsets of those devices without returning to the magistrate for additional judicial approval.
- The warrant encompassed devices with confidence intervals sometimes larger than the geofence (one up to ~387 meters), producing potential false positives and capturing movements of innocents who never entered the bank.
- Chatrie was identified from the Step 3 data and indicted; he moved to suppress the evidence obtained via the geofence warrant. The court found the warrant constitutionally defective but denied suppression under the Leon good‑faith exception.
Issues
| Issue | Plaintiff's Argument (Chatrie) | Defendant's Argument (Government) | Held |
|---|---|---|---|
| Validity of geofence warrant — probable cause/particularity | Warrant searched all Google users in the area without particularized probable cause as to each person; mere propinquity is insufficient. | Police had fair probability of locating suspect via Location History; geofence likely to identify perpetrator. | Warrant invalid: lacked particularized probable cause to search every user; broad sweep of innocents not justified. |
| Do Steps 2–3 cure defects / provide sufficient limits | Steps left unlimited discretion to law enforcement and Google; no objective standards or magistrate oversight between steps, failing particularity. | Steps are a sequential narrowing process; de‑identification and successive disclosure protect privacy. | Steps 2–3 do not cure defects: they delegate seizure discretion and lack judicially enforceable particularity. |
| Expectation of privacy / third‑party doctrine for Location History | Chatrie did not meaningfully consent to pervasive, persistent logging; Location History is detailed and Google’s opt‑in UI was unclear — expectation of privacy remains. | User voluntarily disclosed data to Google; short time window here is distinguishable from Carpenter. | Court skeptical of applying the third‑party doctrine to Sensorvault data; declined to resolve standing/consent conclusively but recognized significant privacy concerns. |
| Remedy — exclusion under Leon good‑faith exception | Suppression appropriate to vindicate Fourth Amendment; magistrate approved the warrant but magistrate inexperienced and warrant facially deficient. | Officers consulted prosecutors, had prior similar magistrate approvals; reliance on warrant was objectively reasonable. | Exclusion denied: good‑faith exception applies because officer relied on prior practice and counsel, and magistrate had issued similar warrants; suppression would not meaningfully deter. |
Key Cases Cited
- Katz v. United States, 389 U.S. 347 (establishes expectation‑of‑privacy framework for searches of communications)
- Kyllo v. United States, 533 U.S. 27 (use of novel sensing technology to derive intimate details implicates Fourth Amendment)
- Carpenter v. United States, 138 S. Ct. 2206 (cell‑site location records can be a Fourth Amendment search; privacy of detailed location records)
- United States v. Leon, 468 U.S. 897 (good‑faith exception to exclusionary rule for searches pursuant to a warrant)
- Illinois v. Gates, 462 U.S. 213 (probable cause is a practical, common‑sense inquiry)
- Ybarra v. Illinois, 444 U.S. 85 (probable cause must be particularized to the person searched)
- United States v. Jones, 565 U.S. 400 (GPS tracking and expectation of privacy in prolonged location monitoring)
- Maryland v. Pringle, 540 U.S. 366 (probable cause must be particularized with respect to the person)
- Owens ex rel. Owens v. Lott, 372 F.3d 267 (4th Cir.) (warrants to search all persons on premises require probable cause that those persons are involved)
- United States v. McLamb, 880 F.3d 685 (4th Cir.) (good‑faith considerations where investigative technique was novel and officers consulted counsel)