Police Tape is an Android app from the American Civil Liberties Union that is designed to allow citizens to covertly record the police. When activated, it hides itself from casual inspection, and it has a mode that causes it to send its recording to an ACLU-operated server, protecting against police seizure and deletion.
Citizens can hold police accountable in the palms of their hands with "Police Tape," a smartphone application from the ACLU of New Jersey that allows people to securely and discreetly record and store interactions with police, as well as provide legal information about citizens' rights when interacting with the police. Thanks to the generosity of app developer OpenWatch, the ACLU-NJ is providing Police Tape to the public free of charge.
The ACLU says that an iPhone version is "coming soon," though it remains to be seen whether something so potentially controversial passes muster with the App Store.