Study
Turner and Petersilia (1992a) used a randomized experimental design to evaluate the impact of the Intensive Supervision Parole (ISP) program in Dallas, Texas on parolees’ behavior and system costs. The implementation of ISP was assessed to determine whether parolees who participated in the program had fewer arrests and higher employment rates than those parolees who did not participate in the program and received routine parole.
Parolees were deemed eligible for the study if they had both a Salient Factor score of 0–7 (high risk of post-release recidivism) when released from prison and a Risk/Needs Reassessment score of 0–18 (high risk of post-release recidivism) when reclassified 6 months or later after release). Additional criteria excluded those who had been released from prison before January 1986, who had pending felonies, who were currently in jail or prison, who had less than 6 months remaining on parole before discharge, and whose time in community supervision was deemed too short for the ISP program.
The ISP study began in August 1987 and continued through 1988. Once ISP supervisors in Dallas determined a parolee was eligible for ISP, they referred the case for random assignment to the experimental group (ISP) or the control group (routine parolees). There were 221 parolees in Dallas assigned to one of the two study conditions. In Dallas, 91 parolees were assigned to the control group and 130 to ISP. Information was not provided regarding any differences between groups pre-random assignment.
Data for this study was drawn from three sources. First, the Background Assessment Form, which was completed immediately after random assignment, provided information about the parolee’s prior record, demographics, current offense, drug use, risk of recidivism, treatment history, and need for treatment. Second, the Data Collection Form (DCF), completed 6 months after assignment, provided information on program services (number of contacts, counseling sessions, and drug tests) and technical violations, new arrests, employment, and restitution. Third, the DCF was completed again at 12 months and collected identical information for the 7 to 12 months after assignment. The DCF also included a status calendar with the date the parolee was placed on and removed from ISP or routine parole, dates of entry into and release from jail, residential placement, and prison.
Analysis for this study included t-tests and chi-squared tests. Recidivism was measured based upon the number of technical violations or arrests, the seriousness of the violations or arrests, the average total number of arrests, reconviction rate, and the annualized arrest rate (controlling for time not incarcerated). Employment was measured based upon information drawn from the DCFs, regarding parolees who participated in work training programs or secured paid employment. Each parolee was followed for 12 months, beginning on the day of assignment to the experimental or control group.
Study
In the same randomized experimental design, Turner and Petersilia (1992b) also evaluated the impact of the ISP program in Houston, Texas. Once ISP supervisors in Houston determined a parolee was eligible for ISP, they referred the case for random assignment to the experimental group (ISP) or the control group (routine parolees). There were 458 parolees in Houston assigned to one of the two study conditions. In Houston, 219 parolees were assigned to the control group and 239 to ISP. Information was not provided regarding any differences between groups pre-random assignment.
ISP participants in both Dallas and Houston shared similar sociodemographics, prior criminal records, risk-of-recidivism scores, and employment characteristics; however, Dallas parolees had slightly more serious records of prior criminality. Across both sites, more than 90 percent of participants were male, and 60 percent were Black, 29 percent were white, and 11 percent were Hispanic. The average age of participants was 31 years at the time of study involvement. About 85 percent served at least two prison terms, averaged eight to nine prior arrests, and six to eight prior convictions. Nearly all parolees were classified as being at high or intensive risk for recidivism. Prison sentences for parolees were about 10 years, and most were released to parole supervision after 22 months. Typically, parolees assigned to this study had already been on parole for 11 months. No within-site statistical differences between ISP and control groups were found for these characteristics.
The same data on technical violations, new arrests, employment, and restitution was collected. The same statistical analysis techniques were employed.