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We discovered epithelials, skin cell DNA,
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under the victim's fingernails,
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which tells us that he struggled with his killer
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in the moments before his death.
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The way this works,
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we start by trying to exclude Pete's classmates and friends,
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in order to zero in on our killer.
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Now, in order to do that,
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we need to collect DNA samples from all of you.
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What if we refuse?
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Well, you do have that legal right--
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this is strictly voluntary--