Decision Costs, Contract Excuse, and the Westinghouse Commercial Impracticability Case

The literature on performance excuses does not consider the cost of determining whether the conditions established for contract excuse are met. We must incorporate these costs to determine which contract laws are efficient. I show that while the costs of determining whether the conditions for excuse are met will rise with the value of the contested performance, the benefits are unrelated to the value of performance. I conclude that the court should not allow excuse if the value of the contested performance is large.     

Results of the 2018 Rapid DNA Maturity Assessment

Three commercially available integrated rapid DNA instruments were tested as a part of a rapid DNA maturity assessment in July of 2018. The assessment was conducted with sets of blinded single-source reference samples provided to participants for testing on the individual rapid platforms within their laboratories. The data were returned to the National Institute of Standards and Technology (NIST) for review and analysis. Both FBI-defined automated review (Rapid DNA Analysis) and manual review (Modified Rapid DNA Analysis) of the datasets were conducted to assess the success of genotyping the 20 Combined DNA Index System (CODIS) core STR loci and full profiles generated by the instruments. Genotype results from the multiple platforms, participating laboratories, and STR typing chemistries were combined into a single analysis. The Rapid DNA Analysis resulted in a success rate of 80% for full profiles (85% for the 20 CODIS core loci) with automated analysis. Modified Rapid DNA Analysis resulted in a success rate of 90% for both the CODIS 20 core loci and full profiles (all attempted loci per chemistry). An analysis of the peak height ratios demonstrated that 95% of all heterozygous alleles were above 59% heterozygote balance. For base-pair sizing precision, the precision was below the standard 0.5 bp deviation for both the ANDE 6C System and the RapidHIT 200.     

Star Power: An Experiential Learning Exercise to Foster Ecological Perspectives on Power,Privilege, and Oppression

The purpose of this article is to describe the utility of Star Power as an experiential learning exercise applied in a community psychology undergraduate course. This exercise simulates systems of power, privilege, and oppression while fostering an ecological perspective that raises students’ awareness and knowledge about power differentials within society. The simulation of trading and lawmaking works best with 18 to 35 students and takes approximately 80 minutes to conduct. This article highlights three representative student perspectives concerning their participation and experience with Star Power. Strategies for facilitating class discussion are also reported.     

Evaluation of Degradation in DNA from Males with a Quantitative Gender Typing,Endpoint PCR Multiplex

Evidentiary samples submitted to a forensic DNA laboratory occasionally yield DNA that is degraded. Samples of intact chromosomal DNA (both nuclear and mitochondrial) were subjected to a heating protocol to induce DNA degradation. The DNAs were then analyzed using a multiplex PCR assay that amplifies targets of low and high molecular weight on the X/Y and mitochondrial chromosomes. If degradation is random, the amplification of larger DNA targets should be more adversely affected by degradation than smaller targets. In nuclear and mitochondrial DNA from a male donor, exhibiting degradation, DNA quantity estimates based upon higher molecular weight amplicons (HMW) are significantly lower than estimates made using low molecular weight (LMW) Q‐TAT amplicons. DNA degradation estimated using this approach correlated well with actual fluorescence associated with HMW and LMW STR alleles amplified from the same genomic DNA templates. Q‐TAT is thus useful not only as a quantitation tool, but also as an indicator of template degradation.     

Child Protection Intervention in Domestic Violence: An Illustrative Case Narrative

This is a case study, written from the point of view of child protection caseworkers, about their work with one family. They draw on practices originating in solution-focused and brief therapy, response-based theory, and relationship-based practice. The goal is to implement practices that (a) hold the perpetrator accountable rather than the victim, (b) attempt to avoid putting the mother in a position of having to choose between partner and children, (c) capitalize on child protection's unusual mandate in order to provide support for the mother, and (d) position the professional as a supportive ally of the mother and children instead of relying on the investigative stance. The case is an instance of how these goals and principles are operationalized. Examples of their choices include holding the perpetrator accountable instead of the mother, (a) focusing on what the mother is already doing to protect the children rather than what she is not doing, (b) placing the Ministry of Children and Family Development between the perpetrator and the victim, (c) avoiding forcing the mother to choose between her children and her partner, and (d) attending to the qualities of the relationship with the mother.     

The Effect of Police Use of Lethal Force on Murder Levels in American Cities Before and After Ferguson

We assess the effects of police use of lethal force on subsequent murders by victim race and armed status before and after the August 2014 death of Michael Brown in Ferguson, MO. We regress monthly murder levels on instances of police use of lethal force by race and armed status controlling for fixed effects, population, unemployment, and murders in the prior month using city-level data for 93 cities from 2013 to 2015. For 2013–2015, we find that a police lethal force incident predicts a 1.8% increase in murders 2 months following the incident. However, prior to Ferguson, a police lethal force incident increases murders by 4.5% (after 2 months) and we are unable to find any evidence of differential responses to police use of lethal force based on victim race. However, we find evidence of differential responses to police use of lethal force based on victim armed status. Post-Ferguson, police use of lethal force is associated with significant differential responses based on victim race. In addition, we see a shift in the aggregate-level response to police use of lethal force. Post-Ferguson, a police lethal force incident decreases the murder level by 3.8% 3 months following the incident. In addition, lethal force incident involving a non-black victim decreases the number of murders by 4.3% while an incident involving a black victim increases the number of murders by 2.1% (after a 2-month lag). Changes in policing following the events of Ferguson had a generally positive but uneven effect.     

Youth Politics and Culture in Contemporary Latin America: A Review

Youth politics in contemporary Latin America diverge from those of previous generations. Increasingly decoupled from parties, unions, and the state, young people glide seamlessly across previously assumed boundaries: culture and politics, individual and organization, subjectivity and collectivity, virtual and “real.” This article presents findings from a systematic review of research on youth politics and demonstrates the new direction through three main categories: repression, incorporation, and exclusion, relationships between state institutions and youth identities; generational, cultural, and digital lenses, the innovative trends for theorizing current patterns of youth politics; and unsettling politics, the fusion and diffusion of youth political dexterity. The article concludes by highlighting current strengths and proposing future steps to build on this new direction.