Going Under - S5-E2
Factual error: When Eric and Ryan are talking about the motor oil and how the wear and tear on the engine make the motor oil unique to the bike. The oil left on the gun would not have matched the oil in the bike any longer since they were still being ridden and the engine would have still been depositing metal into the oil.
Answer: Earlier in the episode, Horatio tells Mac that Penrod was seen in Tribeca getting his leg set, only to bolt when he learned a nurse wised up the cops. Caine and the NYPD probably got Penrod's address from the hospital.
Cubs Fan ★