'Blue wall of silence' takes hit in Chauvin's murder trial

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'Blue wall of silence' takes hit in Chauvin's murder trial

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)
In this image from video, witness Minneapolis Police Officer Nicole Mackenzie 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)
In this image from video, defense attorney Eric Nelson, left, with defendant former Minneapolis police Officer Derek Chauvin, prepares to question a witness as Hennepin County Judge Peter Cahill presides, Wednesday, April 7, 2021, in the trial of 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)

'Blue wall of silence' takes hit in Chauvin's murder trial

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)
In this image from video, witness Minneapolis Police Officer Nicole Mackenzie 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)
In this image from video, defense attorney Eric Nelson, left, with defendant former Minneapolis police Officer Derek Chauvin, prepares to question a witness as Hennepin County Judge Peter Cahill presides, Wednesday, April 7, 2021, in the trial of 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)