Stephen Toulouse, the director for policy and enforcement for the Xbox 360's Xbox Live online service, announced via Twitter on December 2 that Call of Duty Modern Warfare 2 players who abuse the "javelin missile exploit" will be banned from the entire Xbox Live service.
Depending on the severity of the abuse, the ban may last between 24 hours and a few weeks or, in extreme cases, the ban may be permanent.
Read the full post here on examiner