The group-based law enforcement mistrust scale: psychometric properties of an adapted scale and implications for public health and harm reduction research

Background Negative encounters with law enforcement—direct and vicarious—fuel mistrust. When considered as part of the ‘risk environment’ in public health and harm reduction research, law enforcement mistrust may have broad implications. For example, fearing arrest may prevent someone from calling 911 when witnessing an overdose or lead to syringe-sharing and community spread of HIV. For people in the US who identify as Black or African American, these effects may compound, given the ways in which communities of color have been overpoliced. The purpose of this study is to investigate the psychometrics of an adapted scale of law enforcement mistrust—the Group-Based Law Enforcement Mistrust Scale (GBLEMS)—and evaluate its associations with racial and ethnic identity and experiences with law enforcement. Methods This cross-sectional survey took place in a small city in the Western United States where only 3% of the population is Black or African American. The sample included Black or African American and Hispanic and Latina women at risk of HIV, and members of their social networks, yielding a diverse sample across racial, ethnic, and gender identities ( N = 219). The GBLEMS is a 12-item scale adapted from the Group-Based Medical Mistrust Scale (GBMMS; Thompson et al. 2004). The current analysis evaluated the psychometric properties of the GBLEMS (reliability, exploratory factor analysis) and its associations with demographics, other race-based constructs, and experiences with law enforcement. Results The GBLEMS demonstrated strong reliability (Cronbach’s alpha = 0.92) and exploratory factor analysis indicated that items loaded onto two factors—mistrust and disparities in treatment. There was also support for the scale’s construct validity. As hypothesized, GBLEMS scores were higher among respondents who identify as Black or African American, and among those who reported other experiences of racial discrimination, medical mistrust, and negative encounters with law enforcement. Conclusions This study yielded support for the reliability and validity of the GBLEMS as a multi-item, two-factor scale measuring group-based law enforcement mistrust. When framing public health and harm reduction research in terms of the risk environment, law enforcement mistrust may be important to measure as part of a comprehensive approach that addresses persistent racial disparities.