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  From TIME Magazine, October 8, 2001 By David Bjerklie, Christine Gorman and Alice Park Chemical plants some 850,000 facilities in the U.S. handle hazardous chemicals. Many substances that have benign industrial uses, such as metal cleaning or photo developing, can in theory be turned into dangerous weapons. But gaining access to plants, either for sabotage or to get raw materials, is difficult. Employees handling hazardous materials undergo security background checks, and chemical manufacturers across the country last week were double-checking their employee rolls. Since Sept. 11, most facilities have barred outside visitors and allowed only authorized personnel to enter.
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