The U.S. Attorney for the Southern District of Texas has subpoenaed documents from Halliburton in regards to their dealings with Iran. Halliburton did business in Iran, through a subsidiary based in the Cayman Islands, to the tune of $38 million last year.
The Treasury Department's Office of Foreign Assets Control has been investigating Halliburton's operations in Iran since 2001, so I would assume that at least a portion of the investigation is concerned with business dealings while Dick Cheney was CEO of the oil field services corporation.
I'm sure most of us are aware that Cheney's Halliburton had business dealings with Iraq under Saddam, also through a foreign subsidiary.
Nice one, smarty jones.
