Hack tool detected(1)(.50) Or something like that?

Hey I was just trying to get in a game and all of a sudden I get a message saying "Hack Tool Detected (1)(.50)" or something along those lines. I've never hacked and while people report the crap out of me (because I'm not an idiot who stands there letting ghosts slash him) for being good at GM. I just wanted to know if this is like an account investigation or what? Because I A.) Don't want to lose my honorable soldier ribbon, B.) need to get game time for the Iron man ribbon, And C.) I've never hacked. (CrossFire anyway. Used to really bug people in Combat Arms because they screwed my account up and deleted all my stuff)
So yeah any help would be great. Thanks!