EDISON - The American Civil Liberties Union of New Jersey has taken its mission of policing the police to smartphones.

The ACLU-NJ is releasing an app called Police Tape that lets users secretly record police stops with a stealth mode that hides the fact that recording is happening.

When you start recording, the screen goes black as if the phone is off. The video is automatically uploaded to the ACLU when the user stops recording, so it can not be deleted by cops on the scene.

The free app is launching for Android users. A version awaiting approval from Apple will be available later this summer in the App Store for iOS users.

ACLU leaders say the only other branch with an app like this one is New York.