Can an agency order an employee to take an alcohol test?
Generally, agencies do not have authority to impose mandatory alcohol tests. Law enforcement personnel on federal property may administer alcohol tests to drivers when there is an accident or reasonable cause to do such testing. However, cause for such testing must be based on a violation of motor vehicle and traffic rules and not mandatory testing by the agency.

An agency may conduct voluntary alcohol testing. If intoxication is indicated by the test, the agency may use it as a basis for some type of administrative action, such as sending the employee home, or taking disciplinary action. An agency may not take disciplinary action solely because an employee declines to undergo a voluntary alcohol test.