11.   The California Highway Patrol stepped up inspections of trucks hauling hazardous materials.

12.   They also say that U.S. truckers who haul hazardous materials have to pass a background check, while Canadians and Mexicans do not.

13.   Police pull over truckers hauling hazardous materials to check their papers.

14.   A new anti-terrorism law requires the federal government to conduct background checks of all drivers before issuing or renewing licenses allowing them to haul hazardous materials.

15.   Al-Marabh is a former Boston cab driver who was licensed in Michigan to haul hazardous materials.

16.   Eighteen of them were for hauling hazardous materials.

17.   In the United States, more arrests were made of Middle Eastern men who obtained bogus licenses to haul hazardous materials.

18.   Samford also hauls contaminated materials to a hazardous waste site and uses chemical tests to assure a property is clean before seeking a health department inspection, he said.

19.   Separately, more arrests were made of Middle Eastern men who obtained bogus licenses to haul hazardous materials.

20.   The department also directed its field staff to visit thousands of trucking companies that specialize in hauling dangerous materials.