It depends on the crime. Historically, someone who murders a stranger (ie, serial killers) is nearly always caught because one victim gets away and tells the p

It depends on the crime. Historically, someone who murders a stranger (ie, serial killers) is nearly always caught because one victim gets away and tells the police. http://www.wired.com/2011/04/mf_billjames/all/ http://www.wired.com/2011/04/mf_billjames/all/ Otherwise, the cops are generally stuck with their habits of sniffing around friends and acquaintances of the victim (which by definition are doing the non-stranger murders).