The Inmate Drug Testing Unit oversees the inmate random drug testing program, substance abuse program drug testing and “for cause” drug testing for all correctional facilities statewide. Inmates are chosen at random for substance abuse program drug testing based upon a random computer-generated selection system. Selection of inmates for “for cause” drug testing is based upon reasonable suspicion of involvement with drugs or alcohol. Drug testing enables the Department to detect and identify inmates using illicit drugs, including abuse of prescription drugs and/or alcohol. Drug testing has been recognized as highly effective in identifying offenders who have substance abuse problems, getting them into treatment, and monitoring them during the treatment process. The Office of the Inspector General conducts unannounced drug interdiction operations, by searching employees, visitors, inmates, vehicles and areas on department grounds for contraband.