Originally Posted by passmeby

Some DNA tests taken privately (outside of courts) ARE admissable, some aren't. Legal (admissable) DNA tests must have what's called a "chain of custody" for the sample collection-the samples are collected, stored and transported by officials certified to do so. It's possible that this person does have a legal DNA test even if he went about it outside of the courts. He should contact the agency that did the testing to know whether or not his test is admissable (if he doesn't already know).

A lot of people do DNA testing outside of the courts simply because they do not want the courts involved-usually for financial and custody reasons.