Preliminary Studies into the Characterization of Chemical Markers of Decomposition for Geoforensics*

Abstract: In this paper, we report the results of our preliminary studies into chemical characterization of the fluids produced during decomposition in the absence of a soil matrix. Pig (Sus domestica) carcasses were used to model the human decomposition process in two separate locations, Western Australia (Perth) and Canada (Oshawa). Analysis involved simple dilution and filtration of the decomposition fluids followed by gas chromatography–mass spectrometry. Several previously unreported compounds were detected in the decomposition fluid samples during the trials, including benzeneacetic acid, benzenepropionic acid, 2‐piperidone, and isocaproic acid. Possible biosynthetic pathways for some of the compounds produced are proposed. Further research trials are required, particularly in the presence of soil matrices.     

PCR-based detection of salivary bacteria as a marker of expirated blood

Distinguishing between bloodstains caused by a spatter pattern or by expirated blood may be crucial to a forensic investigation. Expirated blood is likely to be contaminated with saliva but current techniques have limited sensitivity, especially with small bloodstains. We report that a PCR assay, designed to detect salivary bacteria, can amplify streptococcal DNA from saliva stains applied to fabrics for at least 62 days after seeding. Bacterial DNA was detected when 0.01 µl of saliva was present in the stain and the amplification was not affected by contamination with blood. These findings indicate that PCR amplification of salivary microbial DNA may have application in the identification of expirated bloodstains in forensic case-work.     

Who Fears the HPV Vaccine,Who Doesn’t,and Why? An Experimental Study of the Mechanisms of Cultural Cognition

The cultural cognition thesis holds that individuals form risk perceptions that reflect their commitments to contested views of the good society. We conducted a study that used the dispute over mandatory HPV vaccination to test the cultural cognition thesis. Although public health officials have recommended that all girls aged 11 or 12 be vaccinated for HPV—a sexually transmitted virus that causes cervical cancer—political controversy has blocked adoption of mandatory school-enrollment vaccination programs in all but one state. An experimental study of a large sample of American adults (N = 1,538) found that cultural cognition generates disagreement about the risks and benefits of the vaccine through two mechanisms: biased assimilation, and the credibility heuristic. We discuss theoretical and practical implications.     

Officer-involved shootings: testing the effect of question timing on memory accuracy for stressful events

Journal of Experimental Criminology - This randomised controlled trial tested the effect of immediate versus delayed, as well as repeated, questioning on memory retrieval regarding details of...     

Reciprocal Effects between the Perceived Environment and Heterosexual Intercourse Among Adolescents

This study proposes a transactional model for the reciprocal relationship between increased likelihood of adolescent sexual intercourse and decreased connection with the perceived environment. Connection with the perceived environment is operationalized as higher problem-focused interactions with parents, lower religious attendance, and lower school belonging. Relationship with the perceived environment is further hypothesized to explain the increase in depressive symptoms associated with initiating sexual intercourse in adolescence. Data from Waves 1 and 2 of the National Longitudinal Survey of Adolescent Health (one year apart; valid N=10,873) were analyzed using survey-adjusted multiple and logistic regression and path analysis. Hypothesized relationships were confirmed, with an additional finding that relationships with the perceived environment do not improve with the cessation of sexual intercourse. Implications of a possible explanation for this, that this finding indicates sexually active youth earn a stigmatized “non-virgin” label that they cannot easily remove, are discussed.Assistant Professor at the Adelphi University School of Social Work. He received his Ph.D. in 2005 from Cornell University in Human Development and completed a postdoctoral fellowship in the Behavioral Sciences Training in Drug Abuse Research program sponsored by Medical and Health Association of New York City, Inc. (MHRA) and the National Development and Research Institutes (NDRI) with funding from the National Institute on Drug Abuse (5T32 DA07233). His major research interests include psychological and social determinants of adolescent and young adult health and risk behaviors, religion as a context of youth development, positive development of sexuality and avoidance of sexual risk behaviors in youth, and young adults, and sexual minority youths’ issues with religion.     

The effectiveness of supermarket posters in helping to find missing children

One approach used to help find missing children is to place posters of them at the exits of supermarkets. The present research addresses the question of how effective that approach is likely to be. Posters of 8 missing children were displayed on a bulletin board at a cooperating grocery store. Customers leaving the store completed a survey and took a recognition memory test for the children. Most customers thought the problem of missing children was an important issue. However, the majority of customers also reported either not looking at the posters or only briefly looking at the posters. Recognition memory for children depicted in the posters did not reliably differ from chance. It appears that there is much room for improvement when it comes to increasing the attention paid to posters meant to help find missing children.