Chemical Enhancement Techniques of Bloodstain Patterns and DNA Recovery After Fire Exposure*

Abstract: It is common in forensic casework to encounter situations where the suspect has set a fire to cover up or destroy possible evidence. While bloodstain pattern interpretation, chemical enhancement of blood, and recovery of deoxyribonucleic acid (DNA) from bloodstains is well documented in the literature, very little information is known about the effects of heat or fire on these types of examinations. In this study, a variety of known types of bloodstain patterns were created in a four‐room structure containing typical household objects and furnishings. The structure was allowed to burn to flashover and then it was extinguished by firefighters using water. Once the structure cooled over night, the interior was examined using a bright light. The bloodstains were evaluated to see if the heat or fire had caused any changes to the patterns that would inhibit interpretation. Bloodstain patterns remained visible and intact inside the structure and on furnishings unless the surface that held the blood was totally burned away. Additionally, a variety of chemical techniques were utilized to better visualize the patterns and determine the possible presence of blood after the fire. The soot from the fire formed a physical barrier that initially interfered with chemical enhancement of blood. However, when the soot was removed using water or alcohol, the chemicals used, fluorescein, luminol, Bluestar^®, and Hemastix^®, performed adequately in most of the tests. Prior to DNA testing, the combined phenolphthalein/tetramethyl benzidine presumptive test for the presence of blood was conducted in the laboratory on samples recovered from the structure in an effort to assess the effectiveness of using this type of testing as a screening tool. Test results demonstrated that reliance on obtaining a positive presumptive result for blood before proceeding with DNA testing could result in the failure to obtain useful typing results. Finally, two DNA recovery methods (swabbing the stain plus cutting or scraping the stain) were attempted to evaluate their performance in recovering samples in an arson investigation. Recovery of DNA was more successful in some instances with the swabbing method, and in other instances with the cutting/scraping method. Therefore, it is recommended that both methods be used. For the most part, the recovered DNA seemed to be unaffected by the heat, until the temperature was 800°C or greater. At this temperature, no DNA profiles were obtained.     

DNA Preservation in Skeletal Elements from the World Trade Center Disaster: Recommendations for Mass Fatality Management*,†

Abstract: The World Trade Center (WTC) victim identification effort highlights taphonomic influences on the degradation of DNA from victims of mass fatality incidents. This study uses a subset of the WTC‐Human Remains Database to evaluate differential preservation of DNA by skeletal element. Recovery location, sex, and victim type (civilian, firefighter, or plane passenger) do not appear to influence DNA preservation. Results indicate that more intact elements, as well as elements encased in soft tissue, produced slightly higher identification rates than more fragmented remains. DNA identification rates by element type conform to previous findings, with higher rates generally found in denser, weight‐bearing bones. However, smaller bones including patellae, metatarsals, and foot phalanges yielded rates comparable to both femora and tibiae. These elements can be easily sampled with a disposable scalpel, and thus reduce potential DNA contamination. These findings have implications for DNA sampling guidelines in future mass fatality incidents.     

Assessing the Impact of State Human Trafficking Legislation on Criminal Justice System Outcomes

Since 2003, state legislatures in the United States have been active in passing legislation aimed at combating human trafficking. To date, all states have passed laws that criminalize acts of human trafficking, though with significant variation in the penalty structure and associated legal provisions. This article examines what aspects of state human trafficking laws are most impactful at increasing the arrest and prosecution of human trafficking suspects. Using panel data on state laws and associated enforcement actions from 2003 to 2012, this study confirms that more comprehensive state laws that invest in antitrafficking resources are most strongly associated with human trafficking arrests and prosecutions. States that make legislative provisions for victim assistance, law enforcement training, statutory task forces, and mandatory reporting have higher antitrafficking criminal enforcement. The political environment in which state human trafficking laws are enacted also influences their enforcement.     

Assessing the Risk of Domestic Violence Reoffending: A Validation Study

Little research has been conducted to validate available instruments for assessing the risk of domestic violence reoffending, especially research using some form of prospective design. This study uses a prospective design to determine the reliability and validity of the Domestic Violence Screening Instrument (DVSI). The analysis is based on a sample of 1,465 male domestic violence offenders selected consecutively over a 9-month period. Data on reoffending were collected in a 6-month follow-up period from a subsample of the victims (N = 125) of these perpetrators and from official records for all perpetrators during an 18-month follow-up period. The empirical results suggest that the DVSI was administered reliably, and they provide significant evidence of the concurrent, discriminant, and predictive validity of this instrument. Implications for further research and utilization of the DVSI are discussed.     

Comparing Women and Men Arrested for Domestic Violence: A Preliminary Report

This study uses criminal justice data to compare women and men arrested for domestic violence on their levels of violence, reported victimization, general criminality, and substance abuse. Participants were 45 women and 45 men convicted of domestic violence between 1996 and 1998. Results indicate that women were less likely than men to have a history of domestic violence offenses and nonviolent crimes. They were also more likely to report that they had been injured or victimized by their partner at the time of their arrest. However, in other ways, women and men were similar: they were equally likely to have used severe violence and inflicted severe injuries on their victims; to have previously committed violence against nonintimates; and to have been using drugs or alcohol at the time of their arrest. The implications for treatment for women arrested for domestic violence are discussed.     

Debunking the social democrats and the myth of equality

This article argues that Sweden's Social Democratic party is an unreliable ally for feminists. It suggests that some of the most formidable obstacles to feminism in particular and progressive politics in general were constructed from within and not outside the party. To support this assertion the author carefully examines their record on women's employment, battery, and sexual assault. She concludes with an overview of additional policies which further demonstrate their abandonment of egalitarian principles.     

A method for impregnating nylon transfer membranes with leucocrystal violet for enhancing and lifting bloody impressions

The objective of this research project was to demonstrate a quick and easy method for impregnating nylon transfer membranes with leucocrystal violet (LCV) for the purpose of lifting and enhancing impressions made in blood. A stamp that would simulate fine detail found in fingerprints or footwear was used to create impressions on a variety of substrates. Four different LCV formulations were tested to determine the effectiveness of the prepared membranes in lifting and enhancing the impressions. Further investigation involved the feasibility of using the LCV membranes in the field by studying the shelf life and storage of the impregnated membranes and the longevity of the lifted impressions. One of the formations studied demonstrated superior lifting and enhancing capabilities, as well as a prolonged shelf life and a resilience of the lifted impressions, thus proving LCV to be an extremely valuable technique.     

Service-Learning and Negotiation: Engaging Students in Real-World Projects That Make a Difference

In recent years, the normative approach to teaching negotation (i.e., using a combination of lectures, case discussions, and simulation exercises) has been under scrutiny. Calls for change stem from the need to increase the real-world applicability of our courses. The author presents service-learning as a potential pedagogical solution. In doing so, she addresses the fit between service-learning and recent calls for change in teaching negotiation; discusses issues related to student learning, course design, and faculty member involvement; and provides sample reflections from past service-learning negotiation students.