I would never do this simply because the results are kept by independent companies and they do not have to tell you what they do with or plan to do with the information-could turn into a very bad situation. Also, since only a small percentage of people (at this time) do this, I cannot see how they can have a database large enough to come up with matches back into the past. We have geneology information about family of three sides through written records that we know are accurate. I am very suspicious of the accuracy of the information from these tests.