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spec: A major agency within the department is the Drug Enforcement Administration ( DEA ) , which enforces narcotics and controlled substances laws , and tracks down major illicit drug trafficking organizations . Crop production relied first on the great natural fertility of soils and then on management practices . The February 16 , 1999 , report of HCFA 's IV & V contractor stated that an integrated schedule that tracks all major internal system activities needs to be established .