I find the study of genetics and the analyses of DNA a marvelous advance in medical science. Because of this research, many sicknesses that are inherited can be cured or treated. However, a study of my DNA just to determine my ancestry? I see no need for it. For the simple reason I believe that we are physically related. In fact, I think these ancestry tests open the doors for scammers. In addition you may be opening up Pandora's Box or a can of worms and unleashing something that you can not control.
For example: According to an article in National Geographic, the results of DNA tests for twins revealed different DNA ancestry. Really? Now imagine if those twins were fighting over an inheritance. Uh huh.
Not only that but, maybe it was just fiction for a James Bond movies, but if it's true science that means that people can alter the DNA. I'm sure everybody remembers the James Bond where Halle Berry was a Bond girl. Not only does DNA alteration have serious implications for crime-solving and proving a person's innocence or guilt, but it basically adulterates or corrupts the "simplistic theory" that the results of a DNA test has all the answers.
Hey! It's what I think. There's no law against thinking.