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First published January 1, 2005
There's a concept in forensics known as the "evidence clock." The clock starts the moment a murder is committed, at which time the hard evidence starts to degrade. Prints mingle, DNA washes away, blood dries and flakes and vanishes. Even psychological evidence atrophies over time. Body positioning is changed as uniformed officers move things. It's an unavoidable aspect to crime scene processing . . . and nobody knows this better than the FBI profilers.