that's all he done it for was money. >> leita nobles still suffers from the poisoning.o this day, she has trouble walking. >> yes, i get angry sometimes. i get to thinking about it, and at first, i couldn't talk about it. i'd just go to crying. i just couldn't talk about it. >> now, scientists all over the world can test cremated remains for various substances. thanks to the hard work and dedication of the scientists involved in this case. >> people sit around trying to think of the perfect crime. and one could say that he nearly did commit four nearly perfect crimes, and there were just a few mistakes. >> i'm not a chemistry major, but i just felt like i hate to lose and i hate to see someone get away with a crime and so it just happened to, would out, and i was very blessed that it did. >> even though in this case the perpetrator had gone out of his way to try to destroy the evidence, the evidence was persistent and it was still there even after cremation. >>> criminals usually leave some kind of trace evidence at the crime scene. the trick is to find it. scientists u