You will only get banned in MW3. VAC bans engin-wise, meaning that every game running the same engine will get banned.
So to answer your question; Yes, you can hack on MW3 and still play other games if you happen to get banned.
If you need to get in touch with me fast, add me on STEAM.
Wrong, if you are VAC ban then you are ban from all games. It bans your entire account
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Minion Since: 13th January 2011 Moderator Since: 6th May 2011 Global Moderator Since: 29th April 2012 Super User/Unknown Since: 23rd July 2013 'Game Hacking' Team Since: 30th July 2013