In the US you don't have to talk to the police, and you never should talk to the police. Remember, they aren't necessarily trying to find the perpetrator, they are trying to convict someone, and that's not necessarily the same thing.

If they can establish you had the means, motive and opportunity, why look for anyone else. Your device can put you close enough to a crime scene that you become the convenient person to convict.

https://www.youtube.com/watch?v=d-7o9xYp7eE&feature=share