Stressful life events and adolescent drug use: Moderating influences of the MAOA gene

Purpose

Though stressful life events appear to impact the likelihood and frequency of substance use among adolescents, these effects are often varied and inconsistent. We suggest that the polymorphic MAOA gene may be partially responsible for variable susceptibility to environmental pressures and substance use. More specifically, we hypothesize that adolescents possessing low activity alleles for the MAOA genotype are more likely to respond to stressful life experiences by initiating substance use.

Methods

The genetic subsample of the National Longitudinal Study of Adolescent Health was analyzed (2,574 adolescents) using logistic regression models for each gender. Respondents’ self-reports of eight key stressors were used to create a composite life stress scale which was allowed to interact with a variable that represented the number of low activity MAOA alleles.

Results

For males, a significant interaction emerged between stressful life experiences and the MAOA gene for alcohol (p = .029) and marijuana (p = .039) initiation. For females, the interaction was not significant in each model.

Conclusions

MAOA interacts with life stress to increase the likelihood of substance use initiation for males. Those with a low activity MAOA allele are more likely to initiate substance use than those with a high activity allele when exposed to stressful experiences.     

The malleability of attitudes toward the police: immediate effects of the viewing of police use of force videos

Purpose: To examine whether videos of controversial police interventions shape individual opinion and, consequently, if attitudes towards use of force are malleable in the short-term. Methodology: A self-administered survey was conducted among 248 undergraduate students as part of a larger project on attitudes towards police use of force. Two groups of respondents were asked general questions about the police: one group was shown fictional videos of controversial police interventions just prior to completing the questionnaire; the other was not. Findings: Results strongly suggest that videos of police interventions have significant effects on reported opinions about use of force: the group that watched the videos was more likely to report that the police frequently use force. Implications: The wide distribution of images by police organizations might have unexpected adverse effects on public attitudes.     

Women in Law Enforcement and Police Use of Deadly Force

We test the hypothesis that law enforcement agencies that have a larger share of female officers should experience lower rates of police use of deadly force. We use the Law Enforcement Management and Administrative Statistics 2013 survey of police and sheriff departments (N?=?1,983). We measure police-involved violence as the number of civilians killed by law enforcement officers from 2013 through 2015 as reported by the website Mapping Police Violence. Using a variety of empirical estimators to take into consideration the structure of the distribution of police-caused deaths, we find consistent results that a higher share of female officers is associated with a higher likelihood of police-caused deaths. These results are consistent with prior findings within the literature and implies that in order to “fit in” with their male counterparts female officers will use coercive tactics to the same extent.     

Binge drinking and negative alcohol-related behaviors: A test of self-control theory

Binge drinking and alcohol-related behaviors have been viewed as major concerns on college campuses. Although national studies were conducted to describe these behaviors, less research attempted to explain them. Self-control theory is extended as a theoretical framework to explain both while considering other known risk factors. Using a sample of college students (n = 268) from a university in the southern United States, the additive and interactive effects of self-control were modeled to predict binge drinking and negative alcohol-related behaviors. A series of multivariate regression models showed that low self-control had effects on binge drinking and related behaviors. Binge drinking's effect on negative alcohol-related behaviors varied across levels of self-control.