[Code of Federal Regulations] [Title 43, Volume 1] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 43CFR421.7] [Page 589] TITLE 43--PUBLIC LANDS: INTERIOR CHAPTER I--BUREAU OF RECLAMATION, DEPARTMENT OF THE INTERIOR PART 421--RULES OF CONDUCT AT HOOVER DAM--Table of Contents Sec. 421.7 Alcoholic beverages and narcotics. Operating a motor vehicle on property by a person under influence of alcoholic beverages, narcotic drugs, hallucinogens, marijuana, barbiturates, or amphetamines is prohibited. Entering property under the influence of any narcotic drug, hallucinogen, marijuana, barbiturate, amphetamine, or alcoholic beverage is prohibited (unless prescribed by a physician). The use or possession of any narcotic drug, hallucinogen, marijuana, barbiturate, amphetamine, or alcoholic beverage on property is prohibited (unless prescribed by a physician).