What's the use of pulling off a crime if you don't get to brag about it to your friends? Some people just can't help themselves. Imagine being so proud of shooting a guy that you memorialize it with a tattoo. He never considered the possibility that the police might see that tattoo when he got hauled in for some lesser violation. And that's evidence that's pretty hard to get rid of. In the internet age, there are more ways than ever to get caught. You may think that only your closest friends will see that video of you bragging about a crime, but word tends to get out.
Remember, nothing on the internet ever really goes away, and that goes for your personal computer, too. If you're a suspect, the police will look at your search history. You know, the questions you asked Google about undetectable poisons and how to hide a body. Make threats online, and they wil be able to find you from your IP address. And when you post about how you're drunk and driving right now, someone is liable to go out and find you. Read about some of the dumbest ways criminals have exposed themselves in a list at Cracked.
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