Now You Know Crime Scenes

With hit cop TV dramas like the various CSI and Law and Order shows, Bones and Criminal Minds. everybody seems to think they're a forensics expert. But what do we really know? Now, with Now You Know Crime Scenes, we can all get the dope on: How long does it really take to analyze a DNA sample? Who started the first forensics laboratory? Who invented criminal profiling? How do you do a walk-through?