If a person volunteers DNA to law enforcement, I am almost certain that it is stored. Just like fingerprints. The FBI has my fingerprints because of what I do for a living, and I am certain that they are in a collective database that can be run at will.
If you have information that DNA is destroyed after collection and exoneration, I would appreciate it. But I just can't see law enforcement destroying such a potential treasure trove.
My opinion.
Not in any database accessible by LE in general, was my point.
By definition that's not like fingerprints.
BTW, nearly all LE involved in criminal investigations have given up their DNA and they (and their unions) have concerns as well. The lid is on that information pretty tight - although of course under the right circumstances, a subpoena can be issued by a court.
I never said it was destroyed. Who wants to have to go the expense of having these officers' DNA analyzed again...and again...and again. Firemen, EMT's, consultants, crime scene photographers, etc, etc. also are asked to give samples - but they are not public.
The samples are very small and it's the computer-generated results of the very complex information that are kept in long term storage. Samples degrade.
But it is not "just like fingerprints." If the FBI has your fingerprints, you signed a form allowing them to collect them (or you were treated as a suspect, which I assume is not the case since it's your employment). So of course they can use it again (but local LE has no access to your DNA results through any national database!)
Your fingerprints - yes, those are in national databases (although mine are there because of the DMV system in my state - not because my employer also requested them - employer has them in a private database).
If we could actually use all the DNA collected by LE in this way, I think the courts would ban it. It doesn't happen. It's NOT like fingerprints! But maybe someday, it will be. I see no laws of this type in the offing at present.