I'll be the counter-argument for a minute. If I'm being arrested for something I'm innocent of, you're DAMN RIGHT I want them taking a DNA sample. That's the fastest and surest way to get cleared of the crime.
I know there are privacy concerns and worries about the integrity of the police. But if I don't give my DNA, I don't have a shot at getting cleared on those grounds.
Now, if I'm guilty I obviously have an interest in not having giving a sample, and I wouldn't want to volunteer one. It should probably be treated like a search of personal property--i.e. compelled by a warrant (or, as is surely the more common case, acquired through trickery).
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