Surprise: people are finding more ways to steal from the U.S. government

Two whistle blowers have accused the private security company and government contractor Blackwater Worldwide (now called Xe) of defrauding the U.S. government.  Perhaps unsurprisingly, most of the accusations seem to hint at a general lack of oversight by the government.  Basically it looks like the government didn't do much to verify expense reimbursements submitted by Blackwater.  This isn't the first time the government has had issues like those alleged by these whistle blowers, and it probably won't be the last.  Weak internal controls and inadequate oversight by the government do not in any way justify fraud, but how many taxpayer dollars need to be stolen before we make a greater effort to eliminate these opportunities?