Yeah I should have added that they need a warrant IF you use a passcode. If you use biometrics they may fall into loopholes that they can search it. Essentially they pretty much own your body when arrested, but not your thoughts. So they can't make you turn over the code without a warrant. Aka if you are going to get arrested turn off your phone. It makes complete sense that you would want to have battery when you got out of jail 8 hours later or I guess longer if they actually had a charge to pin on you. "Why did you turn off your phone" "to make sure I could call someone to pick me up after I get out or call a cab service"