What are you, in law enforcement? This is a story about warrantless collection of DNA in a rape case. Not everyone is a rapist.
That's true.... but if enough people are in the DNA database, then it is likely for many innocent people to wind up being accused.
If police have sampled armchair DNA from 10 million people over the years and built a database of 1 million entries.
If the confidence of a match in the DNA test is 99.99%.
Then that means the test is still wrong 0.01% of the time, so in such a large database, there could easily be 1000 bogus matches.
If police had decided to interrogate the guy; and decided there was probable cause, then I think it was in their rights to get a DNA sample, just like it was in their rights to fingerprint any suspect.
What I see as abusive is covertly securing information from people.
For DNA to be analyzed by law enforcement and attributed to a person: it should definitely be required to be secured in a more reliable manner than gathering from the environment.
Unless the environment is the actual scene of the violent crime being investigated; gathering DNA surreptitiously and in a manner where it would likely be subject to contamination should not be allowed.