Abstract: Systems and methods for detecting diversion in drug dispensing transactions are provided. The systems and methods described provide an integrated platform for collecting and analyzing data that describes a user's drug dispensing transactions and determines a diversion score for the user that indicates the relative severity of the user's diversion activities. The diversion score may be weighted to reflect the relative importance of a respective category of diversion activity to the identification of drug diverters with respect to other categories. Furthermore, in determining a user's diversion score, the user's transaction data may be compared with transaction data regarding the user's peers. In this way, for example, high diversion scores may indicate a high occurrence of suspicious activity, and users having high diversion scores may be further monitored and investigated to determine whether the particular user is indeed diverting drugs for illegitimate use.