DNA testing

States get DNA samples from convicted felons. Everyone knows that. And it's as it should be. But should the police also take samples from people guilty of minor crimes and people that are arrested?

In the U.K., a country that makes everyone have their cheek swabbed for DNA sampling, criminals have been identified as a direct result of the DNA testing 660,000 times. On the other hand, the United States, who doesn't mandate sampling/testing, has only identified 39,000 criminals through this method.

Personally, it it can help solve rapes and murders then I'm all for it. But some may view it as an assault on our privacy. Opinions?