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>> the dna sample was so minute that forensic scientists were unable to build a full genetic sequence. meaning the dna may have come from paul moore, but the scientists couldn't say it was a 100% match. and while the dna didn't match anyone else in the moore family, including peter, the fact that paul couldn't be excluded was nothing that would hold up in court. >> it was beyond frustrating. to hear that we have an almost match but we can't say for sure. >> still, it did give them an idea. they'd get one shot at it. might work. coming up -- >> that got my attention right away. >> exciting do...

Diagram that we received in the mail. >> this is the sheet of paper detective ruiz found. you can see the indentations of the bolt threads in the middle of the page about a third of the way down. and here's that same sheet of paper enhanced by the atf crime lab. and here is the original bomb diagram mailed to investigators back in august. >> the most amazing thing in the world. this is the smoking gun. >> unbelievable. couldn't believe it. exciting doesn't begin to describe. elated maybe. >> then what happens? >> i went out and arrested paul moore. coming up, pete moore seems to be in the cl...

Immediately i looked at this and i'm like, oh my god. what he's holding in his hand is an indented writing copy of the diagram that we received in the mail. >> reporter: this is the sheet of paper detective ruiz found. you can see the indentations of the bolt threads in the middle of the page about a third of the way down. and here's that same sheet of paper enhanced by the atf crime lab. and here is the original bomb diagram mailed to investigators back in august. >> the most amazing thing in the world. this is the smoking gun. >> unbelievable. couldn't believe it. exciting doesn't begin to d...

Couldn't say it was a 100% match. and while the dna didn't match anyone else in the moore family including peter, the fact that paul couldn't be excluded was nothing that would hold up in court. >> it was beyond frustrating. to hear that we have an almost match but we can't say for sure. >> reporter: still, it did give them an idea. they'd get one shot at it. might work. >> coming up -- >> that got my attention right away. >> exciting doesn't begin to describe. elated maybe. >> the most amazing thing in the world. this is the smoking gun. >> a killer seemingly revealed by a blank sheet of pape...

The bolt threads in the middle of the page about a third of the way down. and here's that same sheet of paper enhanced by the atf crime lab. and here is the original bomb diagram mailed to investigators back in august. >> the most amazing thing in the world. this is the smoking gun. >> unbelievable. couldn't believe it. exciting doesn't begin to describe. elated maybe. >> reporter: then what happens? >> i went out and arrested paul moore. >> coming up, pete moore seems to be in the clear, but he's got yet another shock in store. >> there is no scale for this. this changes you forever. >> when ...