The reason for sharply limiting the scope of Single Convention to a few types of drugs while letting the Convention on Psychotropic Drugs cover the rest was concern for the interests of industry. Professor Cindy Fazey's "The Mechanics and Dynamics of the UN System for International Drug Control" explains, "concerted efforts by drug manufacturing nations and the pharmaceutical industry ensured that the controls on psychotropics in the 1971 treaty were considerably looser than those applied to organic drugs in the Single Convention."