Quick little bit of knowledge
I know somebody that works @ Microsoft and he basically said that each time you press down one of those letters on your keyboard, there are ways to track exactly what letter you're pressing, when you're pressing it, and from where (your location) you're pressing it. If your must use your computer to communicate in an illegal fashion then simply read the above messages. There seems to be a bunch of very smart people posting to this thread, but unless you're Bill Gates you haven't a clue of what kind of surveillance the DEA has. Be safe.