I feel slightly obliged to write this here, since people really love riffing off on the fact and claiming that all my information is void and my opinions invalid, no matter the detail and backed-up facts. Yes, I do have a VAC ban on record. No, it is not a legit ban. It doesn't matter to me whether or not you wish to believe me, because from your perspective, it's my word against Valve's, and I wouldn't believe it either.

But for the reasonable people, or those aware of the known false-positive VAC bans, I became a victim of one several years ago. (4 or so?) You can read more about known false-positives that Valve is aware of and refuses to revert from the link below. It is a Source Engine related ban, that's all I know. Possibly a mod that changed the way the game was rendered.
- http://en.wikipedia.org/wiki/Valve_Anti-Cheat#False-positive_detections
- https://www.youtube.com/watch?v=FG6fo34JOAk#t=147

The game in question is Counter Strike : Global Ops, where not previously from the ban I had "Purchased," since it is cheaper this way*, before going on to play roughly another 105 hours later. Now Vac bans are permanent and they do NOT tell you why you where banned so even if it was false, because the system is automated, you will never be un banned.

GG valve.