be just about anything, including semen, you're going to be able to link these crimes. and ultimately link it to a particular person. it's all three dna, it's all through the national database and it's specifically for these kinds of horrible predators. >> when you talk about the evidence, how much do they keep? do they keep the hair fibers? a carpet fiber? semen? do they keep it all? >> police will keep a sampling of what they think is relevant. hair is very good, teeth, different body parts. there's so many parts, so many biological parts have dna so you don't need to keep the whole body, obviously. they'll take blood and it can be preserved for a very long time. >> so he had this kill kit allegedly in his car. what else will they look for in the car specifically? >> it's interesting you talk about the kill kit because there