This combination of images from body-camera videos shows police encounters with, top row from left, Jeffrey Melvin in Colorado in 2018, Johnathan Binkley in Tennessee in 2019; bottom row from left, Bradford Macomber in Mississippi in 2016 and Samuel Celestin in Florida in 2019. Police officers in hundreds of deadly encounters across the United States violated well-known law enforcement guidelines that prescribe the safest ways to restrain, subdue and arrest people, an Associated Press investigation has found. (Colorado Springs Police Department, Knox County Sheriff's Office, Gulfport Police Department, Ocoee Police Department via AP)