It's not all bad news, though. While these shows might serve as a how-to guide for Successful Crimin', that knowledge means nothing if the student is a careless dum-dum. As a real CSI once explained:
When they try to escape detection from what they see on CSI, they're actually leaving more evidence. A good example of that is instead of licking an envelope (for fear of providing DNA in their saliva) they'll use adhesive tape. Well, they'll probably leave fingerprints on the tape, and it'll pick up hairs and fibers from the surroundings. So the more effort you put into trying to evade detection, honestly, the more evidence you leave behind.
There's no better example of this than Jermaine McKinney, who used every trick from CSI (his favorite show) to destroy evidence of a brutal double murder. The brilliant plan fell apart not as a result of equally brilliant detective work, but because McKinney tried to dispose of the murder weapon by throwing it in a frozen lake.