MistyWaters
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The suspect would have to commit a crime for LE to get the dna swab though right? What if he doesn't put a foot wrong? Could they arrest and swab on a minor offence like traffic for instance? Could they get the dna surreptitiously and it still be legal?
I can't answer that but considering LE is not judge and jury, people get arrested for crimes they didn't commit all the time. Not enough evidence or enter a good lawyer and the charges get dropped. If this tactic is also used as a means to obtain a DNA sample, I'd be very surprised that a perpetrator who murders two young teens lives an otherwise squeaky clean life. All to often it works the other way, where laws benefit the criminal.