Actually, you can watch someone fire their weapon and notice their lack of recoil, it's not that hard. You'd have to be pretty close though. I've seen it dozens of times because I had two friends do an experiment, so I can tell the difference.
I can't believe you made a thread about this.
Most people can tell a hacker from a pro.
If they can't they are noobs :P
And people who accuse everybody of hacking are having a bad day or should just die.