From Defensetech, Behind the Green Zone Jail Break:
In a war filled with too-strange-for-fiction stories, this may be the strangest yet. Was Iraq's former electricity minister, jailed on corruption charges, really "sprung from a Green Zone prison this weekend by U.S. security contractors?" If so, how did they pull it off? And what does it say about the rapidly-expanding, ridiculously-lucrative, morally-ambiguous field of private militaries?
Robert Young Pelton, author of the recently-published Licensed to Kill: Hired Guns in the War on Terror, tells Defense Tech that his "guess (if the story is true) is that they simply presented their DoD and other credentials and said [the contractors] were there to accompany him to some mythical destination. Once out of prison it is very easy to leave the Green Zone and then take a taxi to Jordan, Syria, Kuwait or Kurdistan."
He also figures that "there was no gunplay or violence involved... [A]nother likely scenario would be to simply bribe the jailer (by paying a family member) and then the jailer making up some cock and bull story."