Varying Definitions
A murder committed by somebody who had never before met the victim, has no criminal record, steals nothing, and tells no one might be a perfect crime. According to criminologists and scientists, this casual definition of perfect crime exists. Another possibility is that a crime might be committed in an area of high public traffic, where DNA from a wide variety of people is present, making the sifting of evidence akin to 'finding a needle in a haystack'.
An intentional killing in which the death is never identified as murder is an example of one of the more rigorous definitions of perfect crime. Other criminologists narrow the range to only those crimes that are not detected at all. By definition, it can never be known if such perfect crimes exist. Many "close calls" have been observed, however—enough to make investigators aware of the possibility of a perfect crime.
Read more about this topic: Perfect Crime
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