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With dna samples from three suspects, scientists hope to determine who killed college student jenna verhaalen. and had it not been for science, there's no telling what would have happened. >> had we not had the dna under her nails or on the collar of her shirt or on the carpet, we may never have solved this crime. >> the dna results left no doubt. jeremy rosser was in jenna's apartment on the night of the murder. >> how would your skip cells be under her nails? >> i have no idea. >> you have no idea? >> handshake? i'm not sure but -- >> that wasn't a handshake. how would your blood end up on t...

With dna samples from three suspects, scientists hope to determine who killed college student jenna verhaalen. and had it not been for science, there's no telling what would have happened. >> had we not had the dna under her nails or on the collar of her shirt or on the carpet, we may never have solved this crime. >> the dna results left no doubt. jeremy rosser was in jenna's apartment on the night of the murder. >> how would your skip cells be under her nails? >> i have no idea. >> you have no idea? >> handshake? i'm not sure but -- >> that wasn't a handshake.