Psychotherapists in the forensic field are in an uncomfortable position. The reluctance of patients to be subjected to such obligatory treatments and to face their own violence contributes to this difficult position. The mission of public safety assigned to these treatments, their assessment through risk of recidivism rather than therapeutic effectiveness as well as misconception by lawyers and authorities of what psychotherapy really is reinforce the difficulty of such a practice. However, a clarification of the nature of each type of interventions allows the establishment of viable psychotherapeutic framework adapted to penal constraints. The developments of approaches specifically tailored to prison settings as well as to sexual offenders are illustrations of this point.