One thing to keep in mind here is that there is a serious problem with the birthday paradox that impacts these DNA fishing expeditions and makes them both dange

One thing to keep in mind here is that there is a serious problem with the birthday paradox that impacts these DNA fishing expeditions and makes them both dangerous and very nearly useless. Throwing any old DNA that comes into your hands into a huge database, with no prior expectation that the person whose DNA your searching is involved in a specific crime you're looking to compare them to but just to see if anything in there matches anything else in there, will turn up false positives with incredible regularity https://www.schneier.com/blog/archives/2008/09/dna_matching_an.html https://www.schneier.com/blog/archives/2008/09/dna_matching_..., https://www.maa.org/external_archive/devlin/devlin_02_11.html https://www.maa.org/external_archive/devlin/devlin_02_11.htm..., etc. DNA fishing expeditions are a terrible, terrible idea.