The model tracks changes in the structure of deviance, explains when a boundary crisis will develop, clarifies how the amplification of deviance eventually ends, and explains how deviant behaviors sometimes become acceptable. The historical data support the explanation that changing moral definitions and rates of behavior depend on demographic and economic changes in society. The two drug epidemics that occurred in the United States since 1880 occurred when structural change expanded pluralism. Contrary to the common view, moral panics were waged after these epidemics began to subside rather than during them. In fact, the findings indicate that the rates of deviance as a socially constructed definition vary inversely with the objective number of persons engaging in the particular behavior. Figure, footnotes, and 91 references (Author abstract modified)