How is this different than the police comparing DNA evidence to samples in their own database? In both cases, the person who provided the DNA did not consent.
That's not a thing. It's innocent until proven guilty; it's legally impossible to gather evidence because they're guilty to use against them. Hell, innocent people's fingerprints can be, and often are, collected at crime scenes. The police can use innocent people's prints to establish a timeline or figure out what their role was.
