title: US extends security clearance for scholars.
authors.forename: Geoff
authors.initials: G
authors.lastname: Brumfiel
mesh_terms: D004641:Emigration and Immigration / Q000331:legislation & jurisprudence*; D012106:Research; D012108:Research Personnel / Q000331:legislation & jurisprudence*; D012637:Security Measures / Q000331:legislation & jurisprudence; D013334:Students / Q000331:legislation & jurisprudence*; D023481:Terrorism / Q000517:prevention & control; D013997:Time Factors; D014481:United States; D037041:United States Government Agencies; D000078329:Workforce