Freezer Mill News Today

Another device here works even better. >> its called a freezer mill. >> reporter: the freezer mill. liquid nitrogen is poured into the mill. a bone fragment encased in a tube dipped inside for deep freezing. >> im sure kids have seen different things put into liquid nitrogen. and it freezes instantly. >> reporter: the sample, brittle enough to blend into a fine powder. the machine uses d s chemicals break down the powder even more. usually this part of the process happens overnight, correct? for...

Obviously entertainment. >> reporter: this doctor is also a professor of forensic science, and dr. richard lee, associate professor, both a at john j. college of criminal justice in new york city. they dont need months to do their job. >> i would say about the size of an inch, inch and a half. >> reporter: all thats needed for them to extract dna, enough to possibly identify a victim. >> we certainly can extract dna from a bone like this. >> reporter: they took us through the process. clean bone...

Another device looks better. >> its called the freezer mill. >> reporter: liquid nitrogen is poured into the mill, a bone fragment inside for deep freezing. >> im sure kids have seen different things put into liquid nitrogen. it freezes instantly. >> reporter: the sample brittle enough to blend into a fine powder. they use chemicals to break down the powder even more. most of this happens overnight. for the sake of television, well move on. dr. li extracts a small amount of the mixture, then on ...