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No way. As far as I'm concerned, my DNA is one of my last remaining privacy's and I won't give it up voluntarily.
But
Others unknown to you can post their DNA and if you are related to them, can be extrapolated from the data.
Say your 4th cousin (shares a great, great, great, great, grand-parent) and some 2nd cousins (great, great, grandparents) post their DNA to a matching site. Then others can extrapolate that to a group of people which includes you. And, since some genetic material doesn't care whether you feel that way, can eliminate about half the group (male/female)
..
You may leave, or abandon, your DNA. Ever spit somewhere? Use a cup, utensils, at a public place? Drop off a can or bottle you used? Give a medical sample ( say a required UA for your job) or donate blood for a drive? Get tested as a marrow donor? Ever get a haircut away from home? Dentist?
Donate clothing?
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Lots of questions in my head, not necessarily on point but kind of related to privacy. Like:
If you get a transfusion, can the donor DNA show up in your blood test for DNA? For how long?
Can they get viable samples from your Pee? Poo?
Some of the legal questions abound:
Should we grab samples from convicted violent offenders? (including juvenile) Most crime happens in certain areas. Having those samples can narrow down a list of suspects and while not "proof" it does help the police focus their efforts.
How about victims? Does a rape victim's dna get tested along with the suspects? If so, is that now apart of the "record" A victim's relative may commit a heinous crime and this data may get it solved.