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England shows that "criminal" DNA databases expand as much as they can.

Now if you're arrested, not necessarily convicted, you'll have your DNA taken and kept on file for a few years. Note that someone had to take England to the EU court of human rights to get this changed so that people found not guilty, or people not charged, won't have their DNA kept indefinitely.

https://www.gov.uk/government/publications/protection-of-fre...

Suppose that's the one of the real reasons of Brexit :)

Not really a good rebuttal. The only reason for not getting our DNA is depending on criminals having repeat offenses?

This is a bad idea, when are you considered a criminal and when is the FBI/police allowed to take your DNA for testing?

When they arrest you? When you are convicted? Convicted in the 1st instance? Upper court?

>That guy who killed a child and left his sperm behind? He is bound to slip up and get arrested for something sooner or later.

Or we can arrest the guy before he commits another crime.