Police can use this info without warrants including tracking you down if someone with related/similar DNA has committed a crime, private companies like insurance/medical can request it without your permission. You have been warned.
Completely bogus information posted above. I have done my DNA on two services and uploaded it to at least 3 other services. Your DNA information is totally private unless and until YOU decide to share it. As to the police getting the information, they can only do so through a properly issued subpoena, as with all requests for information or data. The rule of law does not exclude DNA companies. And no one can request your information on their own unless and until you approve the sharing request. Whew.