In 2004, Sandia National Laboratories issued a report that is available on the Internet here: http://www.sandia.gov/water/docs/SAND2004-1379P.pdf
In this report, Sandia clearly points to a correlation existing between exposure to methylated forms of arsenic and bladder cancer - especially dimethylarsinic acid (DMA).
Agent Blue, which was one of the rainbow agents used during the Vietnam War is DMA. It was sprayed on rice paddies and rice stores throughout Vietnam - especially in the Parrot's Beak region of III Corp.
That a relationship exists between exposure to Agent Blue and Bladder Cancer in Vietnam Veterans is irrefutable. Any suggestion otherwise is illogical and clearly in conflict with existing scientific knowledge and best medical practice.