Jack Seifarth , Jason Ferris , Corinne Peek-Asa , Douglas J. Wiebe , Charles C. Branas , Ariana Gobaud , Christina Mehranbod , Brady Bushover , Christopher N. Morrison
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Unintended reductions in assaults near sobriety checkpoints: A longitudinal spatial analysis
Background
Sobriety checkpoints are a form of proactive policing in which law enforcement officers concentrate at a point on the roadway to systematically perform sobriety tests for all passing drivers. We investigated whether sobriety checkpoints unintentionally reduce assaults in surrounding areas.
Methods
Exposures of interest were sobriety checkpoints conducted by the Los Angeles Police Department between 2012 and 2017. Comparison units were matched 1:2 to sobriety checkpoints, selected as the same point location temporally lagged by exactly ±168 hours. The outcome was the density of police-reported assaults around the checkpoint location.
Results
In mixed effects regression analyses, assault incidence was lower when sobriety checkpoints were in operation compared to the same location ±168 hours [b= -0.0108, 95% CI: (-0.0203, -0.0012)].
Conclusions
Sobriety checkpoints were associated with decreased assault incidence, but estimated effect sizes were small and effects did not endure long after checkpoints ended.
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