If the vehicle does not belong to the driver and is quickly abandoned, a trace may not be possible without examination of forensic evidence. In some cases, the offender may go to extreme measures to discard the getaway vehicle in order to hide his 'tracks' by dumping it in a river or secluded park, and/or setting it on fire; while this may not make solving the crime impossible, it can make the effort more difficult for law enforcement. The criminal investigation can be further complicated by the use of multiple getaway vehicles, which can confuse eyewitnesses, as well as creating multiple places to investigate: each vehicle is a new crime scene. In "Forensics for Dummies", the rookie is reminded: "At a minimum, the crime scene includes ... Areas from which the site can be entered, exited, or even escaped..."