Wachovia, you old rascal! As soon as you wrap up one unsavory scandal, a new possible scandal comes to light. U.S. justice authorities are investigating the bank for possible money laundering through Mexican and Colombian money-transfer businesses. The Wall Street Journal reported on Saturday that “the bank is possibly facing a deferred-prosecution agreement with the US Department of Justice that would subject it to ‘extensive federal oversight,'” but Wachovia denies that any such discussion has taken place.