The implementation of a drug treatment center in a prison environment is described. Such topics as the program initiation, selection of residents, early program operation are discussed. Program activities such as regular group counseling and rational therapy were developed to assist residents in the resolution of personal problems and interactions which contributed to drug abuse. Problems such as lack of communication and staff disagreements as well as evaluation of recidivism rates were included. The focus is on the general types of problems other rehabilitation personnel implementing a similar program in a prison setting might be expected to encounter. (BN)