It is controlled in Schedule II of the CSA as well as under international law. Synthesized from morphine in 1874, heroin was not extensively used in medicine until the beginning of this century. Commercial production of the new pain remedy was first started in 1898. While it received widespread acceptance from the medical profession, physicians remained unaware of its potential for addiction for years. The first comprehensive control of heroin in the United States was established with the Harrison Narcotic Act of 1914.
Pure heroin is a white powder with a bitter taste.
Most illicit heroin is a powder which may vary in color from white to dark brown because of impurities left from the manufacturing process or the presence of additives. Pure heroin is rarely sold on the street. The color and consistency of black tar heroin result from the crude processing methods used to illicitly manufacture heroin in Mexico. Black tar heroin may be sticky like roofing tar or hard like coal, and its color may vary from dark brown to black. Black tar heroin is often sold on the street in its tar-like state at purities ranging from 20 to 80 percent.