Criminal-thinking styles and illegal behavior among college students: validation of the PICTS

The present study examined the relation of self-reported criminal-thinking styles and self-reported illegal behavior among college students. Participants were 177 male and 216 female (N=393) undergraduate students. Participants were divided by gender and further classified into four groups of self-reported illegal behavior: control-status offenses, drug crimes, property crimes, and violent crimes against people. The psychological inventory of criminal-thinking styles (PICTS) (1) measured criminal-thinking patterns on eight scales. Results indicated that males who committed violent crimes against people endorsed significantly higher levels of distorted criminal-thinking patterns on all scales than the control-status offenses, and drug crimes groups. Interestingly, female participants who committed property crimes displayed six significantly elevated PICTS scales whereas females with violent crimes against people had significant elevations on only four of the criminal-thinking style scales. These results extend Walter's initial validation of the PICTS with incarcerated respondents to a non-incarcerated population and show potential use of the PICTS with other populations.     

A preliminary investigation into the comparison of dissolution/digestion techniques for the chemical characterization of polyurethane foam

Due to their widespread use in domestic and commercial premises, polyurethane foams, as either fragmented or bulk foam, are types of evidence commonly found at crime scenes. The traditional approach to determining the evidential value of polyurethane foam (PF) involves comparing recovered and control fragments under low and high magnification, under various lighting conditions, as well as the comparison of their respective dye spectra. As with most forms of trace evidence, chemical comparison is also desirable. In this work, two approaches to chemically comparing foam fragments were investigated, i.e. inductively coupled plasma–optical emission spectrometry (ICP–OES) analysis of the Tin (Sn) content in different foam types; and gas chromatography–flame ionization detection (GC–FID) analysis of soluble components in PFs mobilized by dichloromethane. Seven different foam types were studied and their Sn content was found to be different. They also produced characteristic GC–FID chromatographic profiles whose compounds were identified with gas chromatography–mass spectrometry (GC–MS) analysis. This study suggests that incorporating chemical data obtained from GC–FID/GC–MS and ICP–OES into a case involving PF could be advantageous, as this will enable the forensic scientist to broaden the comparison between control and recovered fragments, and further assess the strength of the evidence. However, ICP–OES analysis is a destructive technique with a relatively short sample turnaround time, whilst GC–FID analysis is more time-consuming and non-destructive, requiring corroboration with GC–MS data. The values of these two analytical techniques in the forensic chemical characterization of PFs are discussed.