I. Introduction
For most of American history, tracking someone required following them. Today, police can reconstruct a vehicle’s past movements by searching a database of records collected by automated license plate readers (ALPRs). Flock Safety cameras capture license plates, vehicle characteristics, locations, and timestamps, creating records that law enforcement can search long after a driver has left the road.¹ What once demanded considerable manpower can now be accomplished in seconds.
The constitutional question is whether recording travel on public roads becomes a Fourth Amendment search when those records are combined. Although an isolated camera observation generally does not constitute a search, a sufficiently comprehensive Flock network should. The constitutional concern is not a single photograph, but the government’s ability to reconstruct someone’s movements into a digital dossier without a warrant.
II. Public Roads, Private Patterns
Drivers know their cars can be seen in public. But there is a difference between being observed at one intersection and having years of trips assembled into a searchable database. A dense network could identify a person’s commute, visits to medical offices, or attendance at political meetings. Data-sharing across jurisdictions makes historical tracking even easier. The question is whether ordinary exposure to public view also means surrendering privacy in the combined record of those observations.
III. What Supreme Court Precedent Says
In United States v. Knotts, the Supreme Court held that using a transmitter to track a car on public roads was not a Fourth Amendment search. Yet the Court left open whether large-scale, dragnet monitoring might require a different answer.² In United States v. Jones, the Court found that placing a GPS tracker on a vehicle was a search, relying on the physical trespass involved. Concurring Justices also warned about prolonged location monitoring.³
Carpenter v. United States offers a stronger analogy. The Court held that accessing historical cell-site location records constituted a search because people have a reasonable expectation of privacy in their physical movements.⁴ Likewise, in Leaders of a Beautiful Struggle v. Baltimore Police Department, the Fourth Circuit found that accessing aggregated aerial-surveillance records revealing people’s travels constituted a search.⁵
In June 2026, the Supreme Court held in Chatrie v. United States that acquiring historical Google location data through a geofence warrant was considered a search, although it did not decide the warrant’s validity.⁶ These cases do not automatically govern roadside cameras: phones can reveal much more precise locations. Nevertheless, they show why courts must examine what an entire surveillance system reveals, not merely what each observation exposes.
IV. The Emerging Flock Litigation
In Schmidt v. City of Norfolk, residents challenged Norfolk, Virginia’s network of 176 Flock cameras. In January 2026, a federal district court ruled for the city, finding that its fixed cameras produced intermittent observations rather than comprehensive tracking comparable to that in Carpenter. The court nevertheless acknowledged that a more extensive network might cross the constitutional line. The plaintiffs appealed to the Fourth Circuit.⁷
The Virginia Court of Appeals reached a similar conclusion in Robinson v. Commonwealth in April 2026. It held that accessing photographs from Norfolk’s limited ALPR system was not a search, while leaving open the question of whether a more pervasive network would warrant a different outcome.⁸
A different result followed in United States v. Kyle in October 2026. After an officer searched ALPR databases, including Flock, and retrieved more than fifty sightings across multiple states over roughly a month, an Oklahoma federal court found a Fourth Amendment search and suppressed resulting evidence.⁹ Unlike the Virginia courts, Kyle focused on the revealing character of the assembled travel history. It is a district court decision, not binding national precedent, but the disagreement exposes a fundamental question: should judges evaluate each camera separately, or the complete record police can retrieve?
V. Where the Fourth Amendment Line Belongs
Not every ALPR query should require a warrant. Locating one vehicle in a handful of publicly visible places differs from reconstructing its daily movements over weeks. The more comprehensive the record, the closer the search resembles Carpenter. Courts should consider camera density, geographic reach, retention periods, and cross-agency access rather than declaring every photograph either protected or unprotected.
Flock also has legitimate investigative uses, including finding stolen vehicles and suspects. Privacy protections don’t need to prohibit those uses. Virginia, for example, generally requires ALPR data to be purged after twenty-one days, subject to exceptions.¹⁰ Yet statutory retention limits cannot settle the Fourth Amendment question. When police seek a detailed historical account of a person’s travel, judicial authorization provides a necessary check.
VI. Conclusion
A single Flock photograph captures one car at one place and time. A network of them becomes a map of an individual’s life. Schmidt and Robinson show that limited networks may fall outside the Fourth Amendment; Kyle shows why extensive historical searches can cross the line. Under Carpenter’s reasoning, a fully realized Flock network should constitute a search when it allows for government officials to reconstruct substantial portions of someone’s movements. The Constitution does not protect less just because surveillance gets easier. The easier it is to watch everyone, the more the law must guard each person. ______________________________________________________________________________ Footnotes 1. See Schmidt v. City of Norfolk, No. 2:24-cv-00621 (E.D. Va. Jan. 27, 2026). 2. United States v. Knotts, 460 U.S. 276, 283–84 (1983). 3. United States v. Jones, 565 U.S. 400, 404–05, 415–16 (2012). 4. Carpenter v. United States, 585 U.S. 296, 309–13 (2018). 5. Leaders of a Beautiful Struggle v. Baltimore Police Department, 2 F.4th 330, 341–42 (4th Cir. 2021) (en banc). 6. Chatrie v. United States, No. 25-112 (U.S. June 29, 2026). 7. Schmidt, No. 2:24-cv-00621; Schmidt v. City of Norfolk, No. 26-1227 (4th Cir. filed Feb. 26, 2026). 8. Robinson v. Commonwealth, 87 Va. App. 262 (2026). 9. United States v. Kyle, No. 26-CR-00189-SEH (N.D. Okla. Oct. 1, 2026). 10. Va. Code Ann. § 2.2-5517 (2025).