Money laundering is a crime, except (like many activities) when it's practiced by government.

Today's Wall Street Journal takes a look at Medicaid Money Laundering.

"The swindle works like this: A state overpays state-run health-care providers, such as county hospitals or nursing homes, for Medicaid benefits far in excess of its typical rates. Then the federal government reimburses the state for "half" of the inflated bills. Once the state bags the extra matching funds, the hospital is required to rebate the extra money it received at the scam's outset. Cash thus makes a round trip from states to providers and back to the states – all to dupe Washington."