Home1997 Treaties and Agreements ...European Community (97-701) – Agreement on Precursors and Chemical Substances Used in the Illicit Manufacture of Narcotic Drugs or Psychotropic Substances hide European Community (97-701) – Agreement on Precursors and Chemical Substances Used in the Illicit Manufacture of Narcotic Drugs or Psychotropic Substances TIAS Office of Treaty Affairs July 1, 1997 Law Enforcement: Narcotic Drugs Signed at The Hague May 28, 1997; entered into force July 1, 1997. With Annexes and Exchange of Letters. Download attachment [2 MB] Tags Drugs European Union Law Enforcement Narcotics Treaties