 Legal monopolies on alcohol remain commonplace, both as a source of public revenue and as a means of control, and the monopolies on opium and cocaine, formerly important for revenue, were converted or reinstituted during the twentieth century to curb the abuse of controlled substances.For example, Mallinckrodt Incorporated is the only legal supplier of cocaine in the United States.The regulation of gambling in many places includes an official monopoly national lottery or state lottery.