Quote from Lieutenant Disher in Mr. Monk and the Daredevil
Captain Stottlemeyer: Now, this doesn't track, does it? The guy hits a deer, runs off the road, crashes into a rock, dead on impact, a few hours go by, maybe a day. Somebody comes along, a stranger. He files the VIN number off the engine, which would have taken a few hours, then torches the car and the body. Why? Adrian Monk: Why, indeed. Is that poison ivy? Lieutenant Disher: No. Adrian Monk: Oh, thank God. Lieutenant Disher: It's poison oak.