Many law enforcement agencies nationwide said the idea to partner with Ring came after the company promoted its product at law enforcement conferences. Some departments have chosen to simply use Ring's Neighbors app, which encourages residents to share videos of suspicious activity. Other agencies agreed to provide subsidies, matched by Ring, to offer hundreds of discounted cameras in hopes of tapping into footage of residential streets, yards and sidewalks. And some police chiefs raffle off the devices. Ring would not disclose the number of communities with such partnerships. Sharing video is always voluntary and privacy is protected, according to the company and police. "There is nothing required of homeowners who participate in the subsidies, and their identity and data remain private," spokeswoman Brigid Gorham said. She said customers can control who views their footage, and no personally identifiable information is shared with police without a user's consent. Realistically, though, if police want video for an investigation, they can seek a search warrant. Tech industry analyst Carolina Milanesi said engaging with police and offering incentives is a "very smart move by Ring" and a missed opportunity for competitors, including Google's Nest and smaller companies such as Arlo Technologies and SimpliSafe. But a staff attorney at the American Civil Liberties Union of Southern California called the system "an unmitigated disaster" for the privacy of many neighborhoods.