Is this possible? If so, must the person being tested have a significant percentage to be identified? I am unsure about one of my great-great grandparents lineage, and would like to know, since census records cannot be found. I have heard about something like this, I believe, something to do with decendants of african slaves trying to find their exact location of origin. From what I read, the tests are accurate enough to pinpoint very specific locations, even villages possibly. This after many, many generations had passed. If I remember correctly, they had a database of DNA from modern day africans from the various regions. These were then compared with decendants of slaves in america. I know that there is some opposition to these kinds of tests, a fear of racial profiling and such. But if the technology exists, I say why not use it? After all, this is America, more and more people are of mixed ancestry. I would really like to know, and I can't be the only one. Any more information would be appreciated.