A lot of perps think they've committed the perfect crime, until "someone" figures out what happened and puts it altogether. They think that they have "all bases covered."Amazingly, it's sometimes the most obvious clue that was left behind. As an aside, I testified in Federal Court that someone in the government had forged my signature. The government called in a handwriting expert who testified that the signature in question matched those of my known signatures, how I "dot my i's, cross my t" and he chirped about how he testified for the NYPD, he has this degree and that degree. He put all of his findings in a report and testified to them. My lawyer destroyed him with the following: "You didn't rule out a tracing, correct? You neither testified to that, nor put it in your report." You could've heard a pin drop. The judge was brain-dead, and I lost. This was the "perfect crime" courtesy of the U.S. Government!