Cocaine prices at the kilogram level remained relatively stable in most major cities during January-March 1993, but are still above their all-time low levels recorded in 1988-89. Moreover, during the first quarter of 1993, the national purity of cocaine decreased at all levels of the traffic, suggesting a slight reduction in availability. heroin prices have declined at the low end of the price range since the early to mid-1980's, and a wide variety of sources and an abundant supply have led to all-time high purity levels. Marijuana prices have increased during the past several years at virtually all levels of the traffic; these prices generally match a decline in marijuana use. However, overall prices for LSD remain low, and other indicators point to increasing use. Tables