I may have my tin hat on for this one, but why exactly does this need to be mandatory? Wouldn't a warrant be more appropriate for something like this?

Quote:
MADISON, Wis. -- Two Wisconsin lawmakers want DNA samples to be taken at the time of every felony arrest, citing arguments that it helps catch, and rule out, possible suspects in other crimes.
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http://www.channel3000.com/news/21357907/detail.html