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In this image from video, Dr. Martin Tobin 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, Minn. Chauvin is charged in the May 25, 2020 death of George Floyd. (Court TV via AP, Pool)

EXPLAINER: Why would an expert witness go without pay?

By KATHLEEN FOODY - Associated Press

In this image from video, Dr. Martin Tobin 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, Minn. Chauvin is charged in the May 25, 2020 death of George Floyd. (Court TV via AP, Pool)

EXPLAINER: Expert uses imagery to explain Floyd’s death

By STEVE KARNOWSKI - Associated Press

In this image from video, witness Jody Stiger, a Los Angeles Police Department sergeant testifies as Hennepin County Judge Peter Cahill presides Wednesday, April 7, 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)

Expert: Lack of oxygen killed George Floyd, not drugs

By AMY FORLITI and STEVE KARNOWSKI and TAMMY WEBBER - Associated Press