The Adult Diagnostic and Treatment Center (ADTC) is a secure correctional facility operated by the New Jersey Department of Corrections. Its purpose is to provide treatment and incarceration for certain criteria meeting repetitive and compulsive male sex offenders who have been sentenced under the New Jersey Sex Offender Act. From its opening in 1976 through at least 1994, ADTC is a unique facility, the "only complex of its kind in the nation devoted exclusively to the treatment of adult sexual offenders". The facility is located in the Avenel section of Woodbridge Township, New Jersey and in close proximity to East Jersey State Prison aka Rahway State Prison. Prior to the opening of the Avenel facility, the program occupied a housing unit at East Jersey State Prison known as "5-Wing". ADTC houses and treats two groups of men: 1. Certain convicted sex offenders willing to engage in treatment who have been sentenced by the Court under the New Jersey Sex Offender Act to serve their sentences at the facility, and 2. Men who are not sentenced under the New Jersey Sex Offender Act, but have committed a sex offense. As of 1/1/2013, the facility had a population of 681. Levels and phases Inmates are divided into "levels" and "phases" based on their therapeutic progress, institutional conduct and compliance, criminal history, outstanding warrants or detainers, and escape risk probability assessment. The "levels" are based solely on therapeutic progress and range from Level 1 to Level 4, with Level 4 being the most advanced. Level 1 inmates engage in psychoeducational work using specially-prepared workbooks, usually assisted by "para-professional therapy aides", who are therapeutically-advanced inmates who have been assigned to paid institutional jobs running therapy groups, providing para-professional psychoeducational counseling to newer inmates, and providing crisis intervention services to other inmates when their therapists aren't available (for example, after hours or on weekends). Level 2, 3, and 4 inmates participate in various modules dealing with subjects such as Anger Management, Arousal Reconditioning, Victim Empathy, and Relapse Prevention, as well as more general "process groups" where any therapeutic issues can be discussed. Inmates may also participate in groups run by para-professional therapy aides, which are videotaped for review by staff members and are limited to specific therapeutic issues. The "phases" correspond to custody levels and determine, among other things, which jobs an inmate is allowed to hold. Phase 1 is the lowest level and corresponds