The establishment of a comprehensive, mandatory drug testing program provides a mechanism not only for identifying abusers but for preventing the loss of public trust and confidence due to drug abuse by officers. The major constitutional issue involved in such programs is that the fourth amendment proscription of unreasonable searches and seizures not be violated. Consequently, departments must ensure that a program is reasonable by balancing three factors: the privacy interests of the individual officer, the interests of the agency, and the circumstances under which the actual testing will be implemented. Seven governmental interests can be weighed against the officer's privacy interest. Among these are increasing public safety, enhancing public trust and integrity of law enforcement, and preventing corruption. Further, testing can ensure that officers are able to provide credible testimony, improve morale and safety in the workplace, reduce loss of productivity associated with drug abuse, and decrease the agency's or municipality's civil liability. 38 footnotes.