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Something to tie clay directly to the crime scene. and? enter the dna. >> i believe it was january 24th, 2012, when i obtained the initial dna report. >> reporter: they had submitted several samples from chanin's body for dna testing. thought the most important thing would be from her neck where she was strangled and her fingernails as she fought off her attacker. some of the samples came back labeled unknown male. which didn't match any of the known suspects, but some other of the dna material could be narrowed down to a very small pool of candidates. starbuck male. >> clay starbuck or austin...

Enough for an arrest let alone a murder charge. they needed something more, something to tie clay directly to the crime scene. and? enter the dna. >> i believe it was january 24th, 2012, when i obtained the initial dna report. >> reporter: they had submitted several samples from chanin's body for dna testing. thought the most important thing would be from her neck where she was strangled and her fingernails as she fought off her attacker. some of the samples came back labeled unknown male. which didn't match any of the known suspects, but some other of the dna material could be narrowed down t...

>> i believe it was january 24th, 2012, when i obtained the initial dna report. >> they had submitted several samples from chanin's body for dna testing. thought the most important thing would be from her neck where she was strangled and her fingernails as she fought off her attacker. some of the samples came back labeled unknown male. which didn't match any of the known suspects, but some other of the dna material could be narrowed down to a very small pool of candidates. starbuck male. >> clay starbuck or austin starbuck or blake starbuck. >> there was no getting around it, dna didn't lie, a...

Microscopic type evidence that might be in it that would have obviously his dna, that would match the insides of the packages but any remnants of the explosive material that he might have used, the wires, and any additional timers that he had in those packages, anything that looks like it was part of the devices that were put in those packages, would be one. but particularly, the hairs and fibers that would be, let's say im bedded in the carpeting, if there is carpeting in the back of that van, or whatever the floor is, because humans continuously shed particles of skin. we all do that nonstop...

Isolate a fingerprint on the envelope of one of the packages that was addressed to congresswoman maxine waters. the one that was intercepted at a congressional screening, mail screening facility in maryland. that fingerprint, they say, matched a fingerprint belonging to sayoc. his fingerprints were in the federal database because he has a criminal past in florida. secondly, they say, they found dna material on devices inside some of the packages, which they describe as a potential match to his dna, which they also have because of the previous criminal conviction in florida. so based on that, t...