Sure Valve could update VAC2 to include code to search and detect exe's that are scanning memory, but that would be like an MD5 scanner. I don't think Valve is concerned with hacks, I don't even think IW is. They shit on us by releasing this game with out proper anti cheat support. I'm not saying I don't like coding/hacking. But when every 10 year old kid can run hacks in the game, by CPing, it does get old fast. Hell I think CS:S has less hackers in it. So basically the point is, use external hacks if you want a almost sure way to not get a ban.