Well, I have been a Criminal Investigator for a little over 4 years now....while in MPI school, they taught us about a theory--Locard's theory. The theory deals in the transformation of physical evidence from one place to another, no matter how small. For example, getting out of your car, you have seat fibers stuck to you....go inside a friends house and you leave some of those car fibers on his couch, and pick up more couch fibers....get it....so when something happens at your friends house, and I collect fibers.....I match the seat type with vehicles of known visiters and....well you get it....

I liked the name, and have never forgotten the theory....