4 C.F.R. § 25.8
Operating a motor vehicle while in the GAO Building, its grounds or on its entry ramps by a person under the influence of alcoholic beverages, narcotic drugs, hallucinogens, marijuana, barbiturates, or amphetamines is prohibited. It is prohibited for anyone to enter or be in the GAO Building or to be on its grounds while under the influence of, or using, possessing, selling or distributing any narcotic drug, hallucinogen, marijuana, barbiturate, or amphetamine. This prohibition shall not apply in cases where the drug is being used as prescribed for a patient by a licensed physician. It is prohibited for anyone to enter the GAO Building or its grounds, or be on the premises while under the influence of alcoholic beverages. The use of alcoholic beverages in the GAO Building is prohibited except when specifically authorized by the Comptroller General or his designee for a particular event. The Comptroller General or his designee shall be advised of such events and shall inform the guards and other security staff of the time and precise locations of these events.
4 C.F.R. § 25.8