In this image taken from video, witness Dr. Bill Smock, a Louisville physician in forensic medicine, testifies as Hennepin County Judge Peter Cahill presides, Thursday, April 8, 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)