A 2-year study of four groups of women (N= 268)—addicts, prostitute-addicts, prostitutes, and female offenders—reveals that the link between female criminal activity and female drug involvement is significant. All four groups report “drug costs” as a major percentage of their monthly expenses. Prostitutes and female offenders report purchasing drugs mainly for resale. Female offenders report most of their income as coming from drugs sales, shoplifting, and larceny. For all of the women addicted to heroin, reselling drugs and prostitution were the usual means of support. There is insufficient evidence at this point in the research to link the use of a specific category of drugs to specific types of offenses. The main determinants in choice of crime for these subjects were skill and opportunity.