To say that DNA sequencing is good technology because it helps solve crimes may be true but there is a fundamental flaw in the logic used to support their Big Brother style plan: they've already caught their suspect without DNA. They should only be allowed to take a DNA sample of a suspect if they are holding DNA evidence that could link someone to the crime. Apart from that, gathering DNA that is unrelated to a specific crime and conducting random searches trying to match to crimes where there is no suspect could be an illegal search. Sure some bad guys will get away but giving too much leeway to authorities is the greater of two evils.