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1. Multi-isotopes in human hair: A tool to initiate cross-border collaboration in international cold-cases

   https://doi.org/10.1371/journal.pone.0275902  

   Bataille, Clément P.; Ammer, Saskia T.; Bhuiyan, Shelina; Chartrand, Michelle M.; St-Jean, Gilles; Bowen, Gabriel J. (October 2022, PLOS ONE)

   Marzaioli, Fabio (Ed.)

   Unidentified human remains have historically been investigated nationally by law enforcement authorities. However, this approach is outdated in a globalized world with rapid transportation means, where humans easily move long distances across borders. Cross-border cooperation in solving cold-cases is rare due to political, administrative or technical challenges. It is fundamental to develop new tools to provide rapid and cost-effective leads for international cooperation. In this work, we demonstrate that isotopic measurements are effective screening tools to help identify cold-cases with potential international ramifications. We first complete existing databases of hydrogen and sulfur isotopes in human hair from residents across North America by compiling or analyzing hair from Canada, the United States (US) and Mexico. Using these databases, we develop maps predicting isotope variations in human hair across North America. We demonstrate that both δ 2 H and δ 34 S values of human hair are highly predictable and display strong spatial patterns. Multi-isotope analysis combined with dual δ 2 H and δ 34 S geographic probability maps provide evidence for international travel in two case studies. In the first, we demonstrate that multi-isotope analysis in bulk hair of deceased border crossers found in the US, close to the Mexico-US border, help trace their last place of residence or travel back to specific regions of Mexico. These findings were validated by the subsequent identification of these individuals through the Pima County Office of the Medical Examiner in Tucson, Arizona. In the second case study, we demonstrate that sequential multi-isotope analysis along the hair strands of an unidentified individual found in Canada provides detailed insights into the international mobility of this individual during the last year of life. In both cases, isotope data provide strong leads towards international travel. 

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2. How accurate are rebuttable presumptions of pretrial dangerousness? A natural experiment from New Mexico

   https://doi.org/10.1111/jels.12351  

   Moore, Cristopher; Ferguson, Elise; Guerin, Paul (June 2023, Journal of Empirical Legal Studies)

   In New Mexico and many other jurisdictions, judges may detain defendants pretrial if the prosecutor proves, through clear and convincing evidence, that releasing them would pose a danger to the public. However, some policymakers argue that certain classes of defendants should have a “rebuttable presumption” of dangerousness, shifting the burden of proof to the defense. Using data on over 15,000 felony defendants who were released pretrial in a 4‐year period in New Mexico, we measure how many of them would have been detained by various presumptions, and what fraction of these defendants in fact posed a danger in the sense that they were charged with a new crime during pretrial supervision. We consider presumptions based on the current charge, past convictions, past failures to appear, past violations of conditions of release, and combinations of these drawn from recent legislative proposals. We find that for all these criteria, at most 8% of the defendants they identify are charged pretrial with a new violent crime (felony or misdemeanor), and at most 5% are charged with a new violent felony. The false‐positive rate, that is, the fraction of defendants these policies would detain who are not charged with any new crime pretrial, ranges from 71% to 90%. The broadest legislative proposals, such as detaining all defendants charged with a violent felony, are little more accurate than detaining a random sample of defendants released under the current system, and would jail 20 or more people to prevent a single violent felony. We also consider detention recommendations based on risk scores from the Arnold Public Safety Assessment (PSA). Among released defendants with the highest risk score and the “violence flag,” 7% are charged with a new violent felony and 71% are false positives. We conclude that these criteria for rebuttable presumptions do not accurately target dangerous defendants: they cast wide nets and recommend detention for many pretrial defendants who do not pose a danger to the public. 

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3. "Crime and Neighborhood Change in the Nation’s Capital: From Disinvestment to Gentrification."

   https://doi.org/10.1177/00111287211005394  

   Golash-Boza, Tanya Oh (January 2021, Crime and delinquency)

   null (Ed.)

   Research on crime and neighborhood racial composition establishes that Black neighborhoods with high levels of violent crime will experience an increase in Black residents and concentrated disadvantage—due to the constrained housing choices Black people face. Some studies on the relationship between gentrification and crime, however, show that high-crime neighborhoods can experience reinvestment as well as displacement of Black residents. In Washington, DC, we have seen both trends—concentration of poverty and segregation as well as racial turnover and reinvestment. We employ a spatial analysis using a merged data set including crime data, Census data, and American Community Survey (ACS) data to analyze the relationship between crime and neighborhood change at the Census tract level. Our findings demonstrate the importance of distinguishing between periods of neighborhood decline and ascent, between the effects of property and violent crime, and between racial change and socioeconomic change. 

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4. Different places, different problems: profiles of crime and disorder at residential parcels

   https://doi.org/10.1186/s40163-022-00165-0  

   O’Brien, Daniel T.; Ristea, Alina; Hangen, Forrest; Tucker, Riley (June 2022, Crime Science)

   Abstract Certain places generate inordinate amounts of crime and disorder. We examine how places differ in their nature of crime and disorder, with three objectives: (1) identifying a typology of profiles of crime and disorder; (2) assessing whether different forms of crime and disorder co-locate at parcels; and (3) determining whether problematic parcels explain crime and disorder across neighborhoods. The study uses 911 and 311 records to quantify physical and social disorder and violent crime at residential parcels in Boston, MA (n = 81,673). K-means cluster analyses identified the typology of problematic parcels and how those types were distributed across census block groups. Cluster analysis identified five types of problematic parcels, four specializing in one form of crime or disorder and one that combined all issues. The second cluster analysis found that the distribution of problematic parcels described the spectrum from low- to high-crime neighborhoods, plus commercial districts with many parcels with public physical disorder. Problematic parcels modestly explained levels of crime across neighborhoods. The results suggest a need for diverse intervention strategies to support different types of problematic parcels; and that neighborhood dynamics pertaining to crime are greater than problematic properties alone. 

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5. Failing to express emotion on 911 calls triggers suspicion through violating expectations and moral typecasting.

   https://doi.org/10.1037/pspa0000412  

   Salerno, Jessica M; Bean, Samantha R; Duran, Nicholas D; Wulff, Alia N; Reeder, Isabelle; Kassin, Saul M (April 2025, Journal of Personality and Social Psychology)

   Coming to suspect that someone has engaged in wrongdoing based on their unexpected behavior is a common phenomenon—yet, little is known about what triggers initial suspicion. We investigated how violating expectations for high emotionality during a traumatic event can trigger suspicion that one has engaged in immoral—or even criminal—activity through moral typecasting. Five studies demonstrate this theory in a criminal context with dire real-world consequences: 911 callers reporting violent crimes generating suspicion by exhibiting unexpected behavior, which could trigger confirmation bias in investigations leading to wrongful convictions. Using both real and tightly controlled simulated 911 calls, we demonstrated that failing to express the expected level of emotion on a 911 call reporting a violent crime led laypeople and police to morally typecast the caller as more of a moral agent capable of perpetrating immoral acts and less of a moral patient capable of being the victim of immoral acts—ultimately increasing suspicion that they were involved in the crime and support for treating them as a suspect. We advance moral psychological theory by demonstrating that failing to express expected levels of emotion about a moral violation can shape moral inferences about someone’s capacity to commit versus be the victim of moral wrongs, thereby generating suspicion that they might have engaged in wrongdoing. We demonstrated this theory in criminal settings to explain how one tragedy can become two: altruistic witnesses calling 911 to plead for help on behalf of another person becoming suspects of the crime they reported because they failed to exhibit the expected emotional demeanor. (PsycInfo Database Record (c) 2025 APA, all rights reserved) 

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