Multiple stable isotope characterization as a forensic tool to distinguish acid scavenger samples

Acid scavengers are frequently used as stabilizer compounds in a variety of applications. When used to stabilize volatile compounds such as nerve agents, the lower volatility and higher stability of acid scavengers make them more persistent in a post-event forensic setting. Compound-specific isotope analysis of carbon, nitrogen, and hydrogen in three acid-scavenging compounds (N,N-diethylaniline, tributylamine, and triethylamine) were used as a tool for distinguishing between different samples. Combined analysis of multiple isotopes improved sample resolution, for instance differentiation between triethylamine samples improved from 80% based on carbon alone to 96% when combining with additional isotope data. The compound-specific methods developed here can be applied to instances where these compounds are not pure, such as when mixed with an agent or when found as a residue. Effective sample matching can be crucial for linking compounds at multiple event sites or linking a supply inventory to an event.     

Patterns of Young Adult Social Roles Transitions Across 24 Months and Subsequent Substance Use and Mental Health

Journal of Youth and Adolescence - Young adults experience social role transitions across multiple life domains, and a deeper understanding of the ways in which these simultaneous transition...     

Effects of Experiencing the Eyewitness Identification Procedure on Juror Decisions

Mistaken eyewitness identifications are believed to contribute to a preponderance of wrongful convictions, underscoring the need to identify methods to help decrease the likelihood of false convictions based on eyewitness testimony. The present study tested the hypothesis that providing jurors with first-hand experience with eyewitness identification procedures could help further sensitize them to the limitations of eyewitness testimony. Eighty college students watched a videotaped mock trial in which the prosecution’s sole evidence was eyewitness testimony. In a 2 × 2 randomized factorial design, we manipulated whether participants heard expert psychological testimony (henceforth referred to as expert testimony) on the limitations of eyewitness identification and whether they experienced an eyewitness identification procedure. As predicted, experiencing the eyewitness identification procedure had a significant impact on juror decisions, suggesting that this procedure could further help reduce the likelihood of wrongful convictions.     

I Spy with My Little Eye: Jurors’ Detection of Internal Validity Threats in Expert Evidence

This experiment examined whether jury-eligible community members (N = 223) were able to detect internally invalid psychological science presented at trial. Participants read a simulated child sexual abuse case in which the defense expert described a study he had conducted on witness memory and suggestibility. We varied the study’s internal validity (valid, missing control group, confound, and experimenter bias) and publication status (published, unpublished). Expert evidence quality ratings were higher for the valid versus missing control group version only. Publication increased ratings of defendant guilt when the study was missing a control group. Variations in internal validity did not influence perceptions of child victim credibility or police interview quality. Participants’ limited detection of internal validity threats underscores the need to examine the effectiveness of traditional legal safeguards against junk science in court and improve the scientific reasoning ability of lay people and legal professionals.     

To Crack or Crumble: Use of the Thin Skull and Crumbling Skull Rules

The psycholegal and medicolegal assessment of injury-related physical and psychological impairments and disabilities is fraught with difficulties, including assessing for physical and psychological risk factors. In the injury litigation context, in Canada, issues related to pre-injury physical and psychological risk factors are best captured by the thin skull and crumbling skull rules. A review of court cases in which these rules have been considered suggests that the rules are not applied consistently. This inconsistency in the application of these rules has contributed to conflicting determinations of cause and damages across trial court, appeal court, and Supreme Court cases. This article provides operational definitions of the thin skull and crumbling skull rules, presents a case that involves a series of court decisions that exemplify the difficulties associated with the application of these rules, and provides recommendations for more effective application of the two rules.     

De/limiting Emptiness and the Boundaries of the Ineffable

Emptiness (śūnyatā) is one of the most important topics in Buddhist thought and also is one of the most perplexing. Buddhists in Tibet have developed a sophisticated tradition of philosophical discourse on emptiness and ineffability. This paper discusses the meaning(s) of emptiness within three prominent traditions in Tibet: the Geluk (dge lugs), Jonang (jo nang), and Nyingma (rnying ma). I give a concise presentation of each tradition’s interpretation of emptiness and show how each interpretation represents a distinctive aspect of its meaning. Given that Buddhist traditions (1) accept an extra-linguistic reality and (2) maintain a strong tradition of suspicion of language with the belief that language both constructs and distorts reality, this paper responds to an issue that is not so much whether or not an inexpressible reality can be expressed, but rather how it is best articulated.     

Effect on Eyewitness Accuracy When Witnesses Are Told versus Not Told That They Will Be Allowed a Second Viewing

Lindsay, Lea, and Fulford (J Appl Psychol 76:741–745, 1991) found that false identifications increased, correct rejections decreased, and correct identifications minimally increased when witnesses were allowed a second viewing of a sequential lineup. We conducted a similar study in which we allowed mock witnesses a second viewing of a sequential lineup. Results indicated that participants who were allowed a second viewing made mostly incorrect identifications. Participants correctly identified the perpetrator more often when they were not told in advance that they would have a second viewing than when they were told. Additionally, those participants who were told that they would be allowed a second viewing incorrectly rejected the lineup more often than those who were not told. The findings yielded conclusions similar to those of Lindsay et al. (J Appl Psychol 76:741–745, 1991) suggesting that witnesses should not be allowed to view the lineup a second time. The results also suggest that, if a repeated lineup is used, witnesses should not be informed of that in advance.