Text of H.R. 4824 – the Extremely Hazardous Materials Transportation Security Act of 2004 – has been posted on the Internet. This bill, if enacted, would require the Secretary of Homeland Security to promulgate detailed regulations relating to
security measures for shipment of extremely hazardous materials. For purposes of this measure, “extremely hazardous material” would mean: a material that is toxic by inhalation; a material that is extremely flammable; a material that is highly explosive; and any other material designated by the Secretary to be extremely hazardous.
http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=108_cong_bills&docid=f:h4824ih.txt.pdf