DNA databases and "volunteers"

"To Try to Net Killer, Police Ask a Small Town's Men for DNA":

Sgt. David Perry of the Truro Police Department and other law enforcement authorities here say that the program is voluntary but that they will pay close attention to those who refuse to provide DNA.

'We're trying to find that person who has something to hide,' Sergeant Perry said.

Interesting. So all police need to do these days to establish probable cause is a refusal to give bodily fluids? Can't wait until the first time this happens here in CA after last year's passage of Prop. 69. You can bet that even though I won't have committed whatever crime they're investigating, I'll be the loudest dissenter to the "If you don't have anything to hide, you don't have anything to fear" hogwash.