Police in Silicon Valley got a little bit of a result, thanks to Apple's find my ipad service.
They used said service to track down a reported stolen ipad. When they got an address, they went to the apartment, knocked and were rather surprised to be let in without question.
They were even more surprised when they found not only the iPad, but 780lb of Crystal Meth (street value: $35m) just laying around the apartment.
http://www.theregister.co.uk/2012/03..._crystal_meth/