Individuals shot by police exhibit distinct patterns of recent prior hospitalizations and arrests

August 17, 2018

“Multiple encounters with healthcare and law enforcement institutions foreshadow firearm injuries and present opportunities for crisis intervention, according to a new study in the American Journal of Preventive Medicine”

Ann Arbor, August 17, 2018:

A study published in the American Journal of Preventive Medicine found that more than 50 percent of people with assault-related or legal intervention (LI) firearm injuries due to law enforcement actions and over 25 percent of individuals with self-inflicted or unintentional firearm injuries were arrested, hospitalized, or both in the two years prior to being shot. While LI firearm injuries are comparatively rare, they are on the rise, increasing 10 percent nationally in the United States over the last decade. The study’s findings contribute important evidence that can be used to reduce and prevent these injuries and deaths.

“Looking at arrest and hospital records in Seattle, we identified some patterns among intent-specific firearm injuries. Notably, individuals shot by police had arrest histories similar to those shot in assaults and homicides and medical histories similar to those with self-inflicted firearm injuries. The individuals who are injured in LI encounters also exhibit disruptive, impulsive, and conduct-related disorders more frequently than individuals in our control group and increased risk of interpersonal and self-directed violence,” explained Brianna M. Mills, PhD, Harborview Injury Prevention and Research Center (HMC), University of Washington, Seattle, WA, USA. “Our results show how many firearm injuries occur after a series of encounters with institutions that are meant to help individuals in crisis, but unfortunately have failed to deter the situation leading to the injury. We believe that each of these encounters represents an opportunity for more effective interventions and long-term solutions.”

The case-control study conducted by Dr. Mills and colleagues identified 763 individuals who sustained firearm injuries and 335 who had motor vehicle passenger injuries in Seattle over a five-year period (2010-2014). Data were obtained from from the HMC trauma registry and Washington State death records. Diagnoses from prior hospitalizations were extracted from the Comprehensive Hospital Abstract Reporting System (CHARS) maintained by the Washington State Department of Health, which documents inpatient treatment and observation stays in all state-licensed acute care, long-term, and cancer specialty hospitals in Washington, including psychiatric units. Arrest data came from the Washington State Identification System criminal history database.

Patients were grouped by firearm injury cause: assault-related (58.1 percent), self-inflicted (28.6 percent), unintentional (9.3 percent), and legal intervention (4.1 percent). In the control group were motor vehicle passenger accidents. The records for the two years prior to the incidents were mined for information about misdemeanor and felony arrests, as well as diagnoses of substance abuse (alcohol, marijuana, and other drugs), and mental disorders (psychosis, depression/anxiety, and impulsivity/conduct disorder). By comparing arrest history, substance use, and mental disorders within the same geographic region and time period in a single investigation, the study helped to clarify how each contributes to the risk of sustaining intent-specific firearm injuries. It is important to note that the findings should be interpreted as providing information on non-causal markers of increased risk, rather than causal risk factors.

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