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?