James Packer's massive punt on the US casino industry could be derailed by a probity investigation into the operations of Melbourne's Crown Casino. The embattled billionaire agreed to pay USD 1.75 billion (AUD 2.59 billion) for the Cannery Casinos chain in 2007 but still requires approval from a US gambling regulator for the deal to proceed. The Sun-Herald can reveal agents from the Pennsylvania Gaming Control Board will visit Melbourne next month...