TheNat'l Treasury Emps

TheNat'l Treasury Emps.Union v.Von Raabcase referenced in the text,involved the testing of U.S.Customs Service employees in line for transfer or promotion to certain sensitive positions involving drug interdiction or the handling of firearms.How did the U.S.Supreme Court rule?

A) That drug testing would be allowed only if the government could establish evidence of a drug problem among that group of customs employees.
B) That the drug testing was illegal and unconstitutional.
C) That the drug testing was justified by the need for national security and by the extraordinary safety hazards attendant to the positions involved.
D) That the drug testing would be allowed because the customs employees, as public employees, had no greater rights than private employees.