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>> greta: is a bag, generally like a knapsack or something, a gym bag, can it be sort of like a mop or sponge and absorb, like, dna particles so you could extract dna from it for a future comparison? is that possible? >> you can certainly extract dna as long as people handle it without gloves, and it picks up a record by where you've been by the dust it contains. the analogy you used at the outset was a sponge. absolutely it's a sponge. that's why we examine clothing in these cases to figure out where somebody's been, what they've done. no particles is too small today. we can magnify and analy...

To be cancer. megyn: how would you take the blood test? >> starting at age 30, women could go once a year for a blood test. they look for dna particles the tumor makes. megyn: isn't there a risk with mammograms? >> a slight radiation risk but it gives you a false sense of security. she comes back in a year and there is a big tumor there. it takes eight years for a lesion to show up on the mammogram. megyn: the blood test would kick in instantly? >> there are a certain series of genes associated with breast cancer and they make abnormal dna. it's too expensive. it's several ho thousand dollars