I wouldn't make it so specific.
Simply ban any use of data gathered by ANY unmanned flying vehicle inadvisable in a court of law. Forbid police agencies from using unmanned vehicles (not just drones, but smaller 'copters as well) and have a $10,000 fine for anyone in law enforcement who operates one, and a $25,000 fine for their immediate supervisor.
No warrants, no permissions, no nothin'. You don't get to use 'em on citizens, boys, not now, not ever.