Didnt a court recently rule that someone taking off a GPS tracker (and throwing it away?) was not theft? My memory is fuzzy on that one.
"Your Honor, that sign on the entrance to the parking lot discussing parking restrictions and enforcement thereof somehow implied that they're giving me this device and authorization to use it how I see fit".
I suppose if someone leaves their wallet on the hood of your car while they're tying their shoelace, they've also authorized you to use their credit cards, right?