In which case did the Supreme Court uphold reasonable drug test of employees?

Question

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The Supreme Court upheld reasonable drug testing of employees in National Treasury Employees Unions v. Von Raab. In this case, the Court ruled that drug testing was constitutional for employees who were involved in drug interdiction or who carried firearms, as these positions presented unusually great risks to public safety if performed by drug users.

In Which Case Did the Supreme Court Uphold Reasonable Drug