In this image from video, Minneapolis Police Lt. Johnny Mercil, a use of force trainer, testifies as Hennepin County Judge Peter Cahill presides Tuesday, April 6, 2021, in the trial of former Minneapolis police Officer Derek Chauvin at the Hennepin County Courthouse in Minneapolis. Chauvin is charged in the May 25, 2020 death of George Floyd. (Court TV via AP, Pool)