St. Louis police block protesters on Sept. 15, 2017, after ex-police officer Jason Stockley was found not guilty of murder. This story was published in partnership with The Trace, a nonprofit newsroom covering gun violence in the U.S. The St. Louis Civilian Oversight Board was founded in 2015 as a check on police power in the wake of the fatal shooting of Michael Brown in Ferguson. But despite more than 50 police shootings in the city over the last five years, the police department hasn’t provided the board materials to review a single case. As a result, the oversight board has been unable to fulfill one of its most critical responsibilities, and the one that precipitated its founding: to prevent the department from mishandling investigations of police violence.