Antiterrorism. USDA closes lab doors to foreign scientists.
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D000383:Agriculture; D005551:Foreign Professional Personnel; D007391:International Cooperation; D011640:Public Policy; D012106:Research; D012108:Research Personnel; D012637:Security Measures; D013334:Students; D023481:Terrorism / Q000517:prevention & control*; D014195:Travel; D014481:United States; D016885:United States Department of Agriculture