VX is one of the most toxic substances ever made; as little as 200 micrograms are said to be fatal. The nerve agent is part of the arsenal of chemical weapons the US has agreed to destroy by 2012. More than 40% has been hydrolyzed, so diluted with water and other chemicals that the Army says it's effectively neutral. But that has created millions of gallons of waste to be disposed of. After officials in New Jersey and Ohio rejected plans to dump the waste in their rivers, it's being trucked out of Indiana 1000 miles through six other states to Port Arthur, Texas, where the toxic residue will be incinerated. What are the risks to public health? Why did other states turn down the money and jobs a government contract will bring? Was Port Arthur's largely black and Hispanic community notified in advance? How did September 11 accelerate the disposal process?