In 1918, the Secretary of Treasury appointed a special committee to study nationwide drug trafficking. They reported dope-smuggling cost the United States $61 million per year, while an increased number of minors were struggling with addiction. Although everyone from housewives, to actresses, to businessmen, to farmers were susceptible to the problem, we reported that prisoners used particularly clever means to procure a steady supply of drugs. Visitors could slip them a "dope sandwich," or two dollar bills with a thin film of cocaine hidden between them. If you couldn't afford to give away two dollars, you could also sneak some powder between torn corners of a postcard. Even more smugglers sewed cocaine into the hemlines of their coats, injected fruit with heroin, or baked opiates into bars of soap. Apparently, not much has changed in the last 100 years.
Read the full story in "The Death That Lurks in Dope"