Check this ABC News Story

It relates to all the contractors in Iraq right now, and how there is no system to really handle problems with them. I would also expect it's quite an insult to the military, there earning chump change to be shot at, when the DoD is happy to bring in hired guns who can be rogues for $1,000-$2,000 a day per contract employee.

Note this:

"If a U.S. military person is suspected of committing a crime, there's an established system to deal with it — court-martial," Singer says. "When a private military person is suspected of committing a crime, there's really not much legal recourse. For example, in Iraq right now, you would have to rely on local law. Well, guess what, there is no local law."