The papers in this volume were prepared as part of an evaluation of the effects of the strict 1973 New York State drug laws. The first paper explores the effects of the laws on heroin use. It analyzes the trends of various indicators of heroin use in New York State over a period of several years. In order to isolate movements unique to New York, these trends are compared with those of comparable indicators for other East Coast states and cities that were not directly affected by the new drug laws. The second paper is on crime committed by narcotics users in Manhattan. It presents the findings of a study of changes in the magnitude of felony crimes committed by narcotics users in Manhattan between 1971 and 1975. The crimes included are all felonies which directly affect victims. The third paper explores the effects of the 1973 drug laws on the New York State Courts. It is concerned primarily with implementation of the statutes dealing with possession or sale of dangerous drugs. The last paper is on sentencing patterns under the 1973 New York State drug laws. (Author/JEL)