The ACLU is releasing an app called Police Tape that lets users secretly record police stops.
The ACLU of New Jersey's executive director, Deborah Jacobs, says it's a tool to make sure police are accountable.
Plenty of phones can record audio and video already. The new app lets them do it discretely with a stealth mode that hides the fact that recording is happening.
The app, first reported by The Star-Ledger is launching for Android users. A version for iPhones is planned.
ACLU leaders say the only other branch with an app like this one is New York.
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Information from: The Star-Ledger, http://www.nj.com/starledger