Minneapolis Police Officer Nicole Mackenzie testified on Tuesday in the trial of former Minneapolis police Officer Derek Chauvin at the Hennepin County Courthouse in Minneapolis. "And it is certainly not part of our ethics or our values".
Hall is seen as a potentially important witness for the defense of former police officer Derek Chauvin, who was seen in a phone video kneeling on the neck of a handcuffed Floyd for more than nine minutes.
Instead of protecting a fellow officer in what is sometimes called the "blue wall of silence", some of the most experienced members of the Minneapolis force - including the police chief and the head of the homicide division - have taken the stand to openly condemn Chauvin's treatment of Floyd.
He also said officers were taught that restraint is considered force and that they must use the least force required because "it's safer and better for everybody involved".
Prosecutors are seeking to prove that Mr Chauvin's actions violated his training and have focused their questions on police guidelines and strategies taught to help officers de-escalate situations.
Mr Floyd's treatment by police was captured on widely seen bystander video, that sparked protests around the U.S. as people demonstrated against racial inequality.
Mr Chauvin's defence team claims the officer did what he was trained to do, and that Mr Floyd's drug consumption and his underlying health conditions caused his death.
Prosecutor Steve Schleicher noted that while some people may become more risky under the influence of drugs or alcohol, some may actually be "more vulnerable".
He said that Mr Floyd had no ability to resist or show aggression once he was face down on the ground. He repeatedly said he was claustrophobic.
"We absolutely have a duty to render that", he said.
Vision of Mr Floyd's violent arrest, and subsequent death, was broadcast around the globe, and re-ignited a debate about anti-black racism spearheaded by the Black Lives Matter movement.
Officers continued to restrain Mr Floyd - with Chauvin kneeling on his neck, another kneeling on Mr Floyd's back and a third holding his feet - until the ambulance got there, even after he became unresponsive, according to testimony and video footage.
She told the jury that if officers can not find a pulse on a subject, they are taught to immediately begin CPR and to administer first aid if they encounter a medical emergency.
Mr Nelson granted that, occasionally, an officer might "look bad" while restraining a suspect, but the officer could still be following the law, and the policies, on the use of force.
He asked whether officers need to take the actions of a crowd into account, police chief Arradondo agreed.
Presented with a still image from an officer's body-worn camera of an EMT palpating Floyd's carotid artery on his neck to check his pulse, Mercil said Chauvin's knee "appears to be between the shoulder blades".
But prosecutors quickly got Mr Arradondo to note that the clip played by Nelson depicted only the few seconds before Floyd was moved onto a stretcher.
He recently informed the court that he will invoke the Fifth Amendment if asked to testify in the ongoing trial of Chauvin, who has been accused of murder and manslaughter in the May 2020 death of Floyd.
"I would say no", Lieutenant Mercil testified.
She said Chauvin also was a field-training officer, receiving additional training so he would know what prospective officers were learning in the academy.