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police officers use DNA in there work for a reason.

well do you know?

well the reason is because the finger prints, fluids, and foot print (ect.), are evidence that some thing happened at the crime scene.

and while they gather info, they send the evidence to a crime lab to be tested. after that they try to think of some suspects that could be there. then if that evidence shows you where there you will prob be one of the main prime suspects.

What else can I help you with?