Sonoma County, California, has agreed to sharply restrict how its code enforcement division uses drones to investigate private property, settling a privacy lawsuit brought by the ACLU Foundation of Northern California on behalf of three county residents.
From Cannabis Enforcement to Broad Property Surveillance
Sonoma County began flying camera-equipped drones in 2019 to investigate illegal cannabis cultivation. According to the lawsuit and prior reporting by the Los Angeles Times, the program later expanded without adequate public disclosure to cover a much wider range of code enforcement matters, including unpermitted construction, junkyard conditions and zoning violations. By June 2025, county officials had used drones more than 700 times to investigate suspected violations on private property without first obtaining warrants, and nearly half of the county’s 2024 drone flights involved matters unrelated to cannabis. The lawsuit alleged the resulting surveillance helped generate more than $3 million in fines between October 2020 and 2024.
What the Settlement Requires
Under the agreement, Permit Sonoma’s Code Enforcement division must generally obtain either an inspection warrant or consent from a property owner, tenant or resident before using a drone to fly over, monitor or record a private home or its curtilage — the area immediately surrounding a residence. The county may still conduct warrantless surveillance in emergency circumstances and may continue monitoring open fields without a warrant, though any images of a home incidentally captured during open-field monitoring must be blurred before public release. The settlement also limits how drone-gathered evidence can be used in enforcement: officials must obtain a probable-cause warrant before pursuing criminal charges based on drone evidence, and misdemeanor or infraction cases cannot be referred to prosecutors based solely on unwarranted drone surveillance.
The Sonoma County Board of Supervisors approved the settlement, which includes $50,000 payments to each of the three plaintiffs; the county denied the lawsuit’s allegations and admitted no liability. “Today’s settlement agreement will protect everyone’s right to privacy in and around their homes,” said Nick Hidalgo, senior attorney with the ACLU of Northern California, adding that the county had “concealed these unlawful searches from the people they spied on.”
A Growing Legal Pattern for Government Drone Use
The case adds to a broader body of litigation and policy debate over warrantless government drone surveillance of private property, an issue increasingly relevant to security and code-enforcement agencies nationwide as drone programs expand beyond their original stated purpose. Agencies operating or considering similar programs may look to the Sonoma County settlement as a template for warrant, consent, retention and data-redaction requirements that could pre-empt future litigation.
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