The largest study to date on the impact of body-worn cameras on police use of force and complaints was just completed in Washington D.C. The study conducted by Lab@DC involved 2,224 officers from the Metropolitan Police Department. The number is important because previous studies, such as in Rialto, CA, involved much smaller numbers. According to the authors of the study, “One of the theories of change underlying the anticipated effects of BWCs is that both officers and civilians on the street will behave differently if under the watchful lens of a camera.” That was the case in Rialto. But in…