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More than 99% of our dna is going to be the same. so the key for them in terms of the sort of genetic fingerprinting or genetic matching as they call it is to focus on the area that is different. and that could make a much shorter time than, for example, sequencing the entire dna. it's not going to be perfect. no one's going to say with 100% accuracy because it is still a little bit of an imperfect science. but that's a little bit of how they do it. >> well, officials have said they compared bin laden's dna to several bin laden family members. do they need to run tests on all the samples simul...

A relative of the person that you're testing. so that's sort of how they do it. and that process can be done within a few hours, anderson. >> how close do the family members need to be? >> that's a good question. you know, for example, if you're looking at a child or a parent, for example, that's going to be the closest because they're going to share at least about 50% of the dna. with siblings that are full siblings, actual siblings, they could share up to 50% as well, but it's a little less clear because parents don't always give the same amount of genetic material to each child or the same ...