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Profile to make that come parson. but it is certainly possible that it came from one of the victims, as well. you have to interpret what we say. >> now, if the dna ends up being her dna, how do they make a link that she then knew about it and what its purposes were as opposed to for example touching the pressure cooker when her husband took it out of the box and put it on the counter? >> erin, you raise a perfect question there. all we can say is that her dna is associated with the bomb or part of the bomb. how it got there, when it got there, could it have gotten there, certainly of course. >...

I think the surprise is that it's from a fe mail. obviously, it's comparative science. >> so they're obviously looking at the wife, they would have to be, she lived in that apartment. when you talk about dna on a bomb, is there a way for them to know whether the dna on the bomb -- a bomb fragment came from a possible victim or if it's somewhere so embedded in the dna of the bomb, for lack of a better word, would you be able to say this dna was around from someone likely around during the building process as opposed to the victim? >> no, erin, you raise a good point. dna could have been from ...

It can point to whether or not there are other people involved in this plot. is there some kind of bombmaker out there, either in the united states or perhaps even in russia that they don't know about? that bombing signature, erin, is so crucial at this point. they, in terms of executing any search warrants right now have not found the missing link to tell them definitively where the bombs were made. and in trying to re-create these things, they don't work that often. very often you have to test them. that's part of that investigation, too. >> the testing and dna they found there as well. than...

>> out front tonight, dr. larry kobalinsky is an expert and advisor to the state department in the ukraine. good to have you with us, lawrence. >> it's a pleasure. >> let me just ask you, i know there are a variety of scenarios here. but obviously, they are collecting dna from the wife and now, obviously, female dna on the bomb. she could have come into contact with this and not have anything to do with making it, right? >> that's absolutely correct. we're talking about skin cells. we're talking about touch dna. you leave yourselves and you leave your dna behind. one of the problems with dna, ...

Look at our baby girl. she didn't deserve this. police say leila and her 12-year-old brother were home alone saturday when he saw an intruder leaving the house. he then found his sister stabbed, severely wounded. she later died. since then, police have been running down leads, but have no specific suspect. >> we are searching extensively in attics and storage sheds. it is a difficult area to search. it's rural, remote. the grass is tall right now. >> there are empty homes and outbuildings around here. there's a lot of huge rocks where somebody could hide in. >> reporter: authorities have combe...