If you've ever been in a did-that-really-just-happen scenario, you might have wished you had a recorder running -- particularly when it comes to run-ins with the law. The American Civil Liberties Union of New Jersey just released an app that allows Android phone users to record and store their interactions with police to hold police accountable." The app, cleverly called "Police Tape," also includes legal information about citizens' rights during encounters with law enforcement. What sets this apart from being just a video camera with a send button is that you can also record in "stealth mode." The app disappears from the screen once the recording starts, "to prevent any attempt by police to squelch the recording," according to the ACLU of New Jersey site. Users can send the recording to the organization through the app for backup storage and analysis. Though there is no federal law preventing recording police in public, some states have different statutes covering such activity. Earlier, the New York American Civil Liberties Union released its Stop and Frisk Watch application. The New York ACLU promotes that app as a way for bystanders and designated event observers to record incidents. That's probably a better idea than whipping out your phone when a cop asks for your license, particularly if you are in an emotionally charged or intense setting. That's probably not going to be received well.