I find evidence from mobile phones to be potentially problematic. If they track your position, you could just leave your mobile phone home when doing crimes, and say that you are home (You can tape it to your dog to make more realistic movement). If they track activity (but not content), you can make a program which sends empty messages to another mobile phone, or calls another mobile phone at some specific time. Finally, if you track content as well, create the content of the messages while you define when to send them, or make a predefined sound record which you transmit when the phone call is coming up.
You could be in a one hour phone call while the robbery you performed happened, and that phone call had your voice in it, and you were home while you called. Isn't that quite the alibi?
You could be in a one hour phone call while the robbery you performed happened, and that phone call had your voice in it, and you were home while you called. Isn't that quite the alibi?
Hard? Sure thing. Impossible? Nope.