It’s easier to collect and leave the DNA of hundreds or thousands of other people at a crime scene than it is to prevent leaving your own

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Stop at a car wash, and empty the vacuum cleaner bag into a plastic bag. Carry to crime scene and release.


LOL. Sherlock Holmes said the best place to hide a needle is among other needles.


Remember that time they thought a bunch of unrelated murder cases from all over were perpetrated by a single serial killer, and it turns out the DNA test kits were contaminated during manufacture?


That was a major plot point of the film *GATTACA*. I recommend it highly.


Yes, but also no. Most likely, there would be absolutely no connection between random people and the victim, whereas the true perpetrator would have such a connection. To name one of the most common connections that would be relevant in any given crime: _motivation_.