Prospective Replication of the Violence Risk Appraisal Guide in Predicting Violent Recidivism Among Forensic Patients

An exhaustive survey of a cohort of forensic patients provided an opportunity for a prospective replication of the predictive accuracy of the Violence Risk Appraisal Guide (VRAG). Data collected during the original survey also permitted a test of the predictive accuracy of clinical assessments of risk on the same cohort. The VRAG yielded a large effect size in predicting violent recidivism (ROC area = .80) over a constant 5-year follow-up and performed significantly better than averaged clinical opinions. The superiority of the VRAG was also observed at very short follow-up times and for very serious violence. Moreover, for 16 subsamples, observed rates of violent recidivism did not differ significantly from the expected rates. VRAG score was unrelated, and clinical judgments inversely related to violent recidivism in the small low-risk sample of female forensic patients. The authors conclude that, regardless of length of opportunity or severity of outcome, actuarial methods are more accurate than is clinical judgment.     

Using hydrophilic adhesive tape for collection of evidence for forensic DNA analysis

Known exemplar samples of human DNA have traditionally been body fluids, such as blood, saliva, and semen. In each case, the presence of water is a risk for the bacterial growth, which may degrade the DNA evidence. In this study, the authors have developed a method that employed a hydrophilic adhesive tape (HAT) for collecting DNA evidence. The HAT method was used to remove surface cells from relatively hairless areas on the body. The area examined were ankle, arm, behind the ear, between fingers and back of the neck. The HAT was then dissolved in the extraction buffer. DNA typing was performed at vWA, THo1, F13A1, and FES loci using the short tandem repeat (STR) analysis. Our results show that the samples collected from ear give the best results with a success rate of 100%. All subjects tested by this method had known STR genotypes established from buccal swabs. The authors' results suggest that the HAT method can be used as a less invasive method for collecting biological evidence for forensic DNA analysis. In addition, this collection method should reduce the risk of DNA degradation due to the moisture, which is encountered using conventional collecting methods.     

GC-MS of ignitable liquids using solvent-desorbed SPME for automated analysis

Solid-phase microextraction (SPME) is well documented with respect to its convenience and applicability to sampling volatiles. Nonetheless, fire debris analysts have yet to widely adopt SPME as a viable extraction technique, although several fire debris studies have demonstrated the utility of SPME coupled with gas chromatography-mass spectrometry (GC-MS) to identify ignitable liquids. This work considers the expansion of SPME sampling from the customary thermal desorption mode to solvent-based analyte desorption for the analysis of ignitable residues. SPME extraction fibers are desorbed in 30 microL of nonaqueous solvent to yield a solution amenable to conventional GC-MS analysis with standard autosampler apparatus. This approach retains the advantages of convenience and sampling time associated with thermal desorption while simultaneously improving the flexibility and throughput of the method. Based on sampling results for three ignitable liquids (gasoline, kerosene, anddiesel fuel) in direct comparisons with the widely used activated charcoal strip (ACS) method this methodology appears to be a viable alternative to the routinely used ACS method.     

Psychopathy and violent recidivism

The violent recidivism rates of 169 adult male mentally disordered offenders released from a maximum security psychiatric hospital were compared over an average 10-year follow-up period. Forty percent of the total and 77% of the psychopaths (as defined by the Psychopathy Checklist) committed a violent offense. It was possible to predict outcome with considerable accuracy using combinations of childhood history, adult history, index offense, and institutional or program variables. However, the Psychopathy Checklist alone performed at least as well as any combination of variables and also improved upon the prediction based on criminal history variables. Psychopaths continued to recidivate at a higher rate than nonpsychopaths even beyond age 40.This research was supported by the Ontario Mental Health Foundation under grant No. 952-86-88. Thanks are due to R. Hare and V. Quinsey for comments on earlier versions of this paper and to V. Bell, C. Lang, L. Koshkerian, S. Robinson, and C. MacKnight for collecting the data.     

An evaluation of a maximum security therapeutic community for psychopaths and other mentally disordered offenders

Psychopaths present serious problems for the criminal justice system because they are responsible for many serious crimes and appear to be very resistant to treatment. The present study was a retrospective evaluation of the efficacy of a maximum security therapeutic community program in reducing recidivism among mentally disordered offenders, some of whom were psychopaths. The study employed a matched group, quasiexperimental design. The results showed that, compared to no program (in most cases prison), treatment was associated with lower recidivism (especially violent recidivism) for nonpsychopaths and higher violent recidivism for psychopaths. The clinical and research utility of Hare's Psychopathy Checklist was strongly supported.