A new study has found that areas with Black Lives Matter protests saw a 15-20% reduction in police officers’ use of lethal force — resulting in roughly 300 fewer police homicides.https://t.co/otf6WzkRUy

— Vox (@voxdotcom) April 10, 2021

From 2014 to 2019, Campbell tracked more than 1,600 BLM protests across the country, largely in bigger cities, with nearly 350,000 protesters. His main finding is a 15 to 20 percent reduction in lethal use of force by police officers — roughly 300 fewer police homicides — in census places that saw BLM protests.

Campbell’s research also indicates that these protests correlate with a 10 percent increase in murders in the areas that saw BLM protests. That means from 2014 to 2019, there were somewhere between 1,000 and 6,000 more homicides than would have been expected if places with protests were on the same trend as places that did not have protests.