The influence of polygraphs on evaluators' decisions regarding sexually violent persons.

Abstract

Objective: This study examined the degree to which polygraph results affected evaluators’ decisions regarding patients committed as sexually violent persons (SVPs) in Wisconsin. Specifically, we examined evaluators’ opinions on patients’ significant progress in treatment (SPT), suitability for supervised release, and suitability for discharge. Hypotheses: We hypothesized that having failed a polygraph during the prior year would predict evaluators’ opinions that patients did not meet criteria for SPT, supervised release, and discharge from civil commitment even after analyses controlled for other factors related to evaluators’ decision making. Similarly, we hypothesized that patients taking and passing polygraphs in the year before the evaluations would predict positive recommendations for the aforementioned outcomes. Method: All patients civilly committed under Wisconsin’s SVP statute who had a Treatment Progress Report (TPR) and a Chapter 980.07 evaluation completed by a state-employed forensic evaluator in 2017 were eligible for this study; we selected a random sample of 158 participants. TPR and 980.07 evaluation reports were coded to reflect evaluators’ opinions regarding SPT, supervised release, and/or discharge. All polygraph types and outcomes completed within the review period were coded. Results: Results indicated that taking and passing polygraphs significantly predicted favorable evaluator opinions regarding SPT after analyses controlled for other potentially relevant factors. Polygraphs were not significantly predictive of discharge or supervised release recommendations after analyses controlled for other factors. Conclusions: Some polygraph outcomes may affect specific evaluator opinions regarding treatment progress.