Confusion
Creative Spelling Expert
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I'd just like to add my opinion on why they check DNA from suspects/POIs but it doesn't rule them in or out. I think they have some DNA that they suspect may have come from the murderer and more that is from innocent people, but they aren't positive about which DNA is which. When they check DNA from a suspect, a match would likely be enough to make an arrest unless there was a valid reason for his DNA to be there. If the suspect's DNA doesn't match any of their samples, it doesn't rule the person out because he may have just not left any there. MOO