We've had a rash of car break-ins in my neighborhood. My roomate had a large metal ball hucked through his car window, and when the police called, the dude refused to bag it for evidence, take it with him, fingerprint it, or anything. I'd say to consider yourself lucky if your local beat police give a damn about collecting evidence of a crime that's not drugs, violence, or human trafficking.
EDIT: Just remembered, instead, he picked up the metal ball and started tossing it around, from hand to hand, into the air, etc. All casual like - as if it were a toy. Callous disregard for his job and totally destroyed the evidence.