According to what i have read a felony gives them your dna, not sure if they are able to have a person come in for questioning offer them a can of soda then collect it after they leave. Jmo
Yes, I have read that too, that a felony gets your DNA, however if they're bringing someone in for questioning, they won't know if that guy's DNA matches someone in their felon DNA bank or not, unless the guy gives his permission and gives a sample... I'm not sure if LE is allowed to take a sample from a person being questioned or not, by way of offering them a drink or something? But even if not, they can get DNA by just following the person around until they discard something.. but that would sure be difficult to come up with the resources to do so for some 300 people questioned (so far)?