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Found in almost every cell of your body. therefore, it can be left behind in bodily fluids that you leave behind such as blood, semen, saliva, almost sometimes hair and skin cells as well. and forensically, i could use those bodily fluids to develop what i call a dna profile. which would be to analyze the dna at certain locations on the dna molecule, develop a dna profile that could be used for identification purposes and comparison. >> are there other uses for this technology other than a forensic or criminal setting? >> yes. several fields use dna. the same dna testing that i use. it's used ...

>> it's hard to get your head around the fact that her sister was also a teenager when she disappeared. >> sure. and this could trigger things, memories, and i can't stress enough the forensic investigation is going on at that home. and they're going to uncover things. but what she tells investigators on the continual basis is going to be critical to what they possibly can find forensically. >> i hope they can do this quickly. i hope they can release her from having to face these memories every day with people she has never known, with people who aren't her family members as delicate as they a...

Not likely to come back. that could be something we don't find for some time. and number three, just simply looking at the material that was on his person will help us forensically to compare it to ied -- not just ieds but suicide vests in iraq, afghanistan and even chechnya, to be able to compare the exact way it was made, which will tell us quite a bit. >> bob, if this guy wanted to be a suicide bomber, why didn't he at least attempt to do it at the race? >> we have seen actually some other complex attacks where the cell first did an ordinary attack and then did effectively a suicide attack ...

That's what their goal is. >> there is also the issue, michael, of tracking any of this. because the materials were so commonplace. the "new york times" talks about the pressure cooker itself. one brand with 6l on the bottom is made by the spanish company fagor, which according to the -- with factories in six countries including spain, china and morocco and subsidiaries in nearly a dozen more. it sells about 50,000 of the 6-liter pots in the u.s. every year. >> it's going to be hard, but this is exactly what the fbi and atf unit of the doj does. there are different pieces of this. so the ball ...

This is going to entail. >> has there been any major progress? are these guys moving forward? as you answer that, let me show you, here's an fbi photo of a bomb part. the battery and wires. then you have the fbi photo of bomb part -- the pressure cooker. and then the photo of the bomb part of the electronic component or what is known as a circuit board. how are these used in evidence and bottom line from what you've heard, do you think they've made any significant progress today? >> yes, i think they have. they are going to take those items and forensically examine them for fingerprints, for d...