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We have more of them. but we're running out in the wild, and that's where we want them to stay. putting a white tiger back into that population, it's not going to survive. >> we're going to just grab a paw painting. >> before luna wakes up, the team makes watercolor paw prints to auction off for fund-raising. while halfway across the country, the paw prints of another tiger could help scientists keep an entire sub species alive in the wild. >> we can actually pick out dna off of the footprints he leaves behind.

Evidence is going to be obtained off of those devices. the fact that he can put together a pipe bomb does not mean that he's forensically sophisticated. if people don't realize it, even if a device explodes, you can still obtain somebody's dna off of one of the components. so that's what here is going to become so critical. so he can put it together, but it doesn't mean he's sophisticated. >> chief ramsey, can you just explain how all the law enforcement agencies actually, you know, the fbi, the nypd, would be working together behind the scenes? it's got to be an enormous undertaking. >> it is...

And are they actually functional? and are they functional to become lethal? and what that will show is the person's -- you heard people over the last 24 hours talk about a signature in this. that means how does he crimp the wires, how does he apply the powder? that becomes important and tells us something as well. and here's the final thing that i think is really important. looking at the package for the one that went to cnn in new york, there was an awful lot of tape on there. there were six stamps. and then there was the envelope that had to be connected. so there's a real good possibility t...