Testifying Monday in the murder trial of Derek Chauvin, Minneapolis Police Chief Medaria Arradondo said that the officer had used excessive force and broken department policy when he pinned George Floyd under his knee for 9 minutes and 29 seconds.

"It's not part of our training, and it is certainly not part of our ethics and our values", Chief Medaria Arradondo told the jury as prosecutors sought to undermine a central plank of Chauvin's defence.

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 Nelson also questioned whether Chauvin's knee was on Mr Floyd's neck, playing a few seconds of bystander video side-by-side with footage from an officer's body camera that Mr Arradondo agreed appeared to show Chauvin's knee on Mr Floyd's shoulder blade.

More police testimony is expected this week, including Minneapolis Police Chief Arradondo, who in June said Floyd's death was murder and "not due to a lack of training".

Parties to the case said in court on Monday that Arrodondo would testify later in the day.

That was Jena Scurry, a Minneapolis police dispatcher.

"We were taught about positional asphyxia all the way back to my academy", Blackwell said, adding that her time with the department overlaps with the length of time Chauvin has also been there. "That has to count for something".

The students were apparently told to follow the same instructions that the real jury was asked to follow by the judge while trying Derek Chauvin. Arradondo and Mayor Jacob Frey also made several policy changes, including expanding requirements for reporting use-of-force incidents and documenting attempts to de-escalate situations.

He said, 'It is relevant because it shows Mr Chauvin's demenaor and actions immediately following Mr Floyd being removed to the hospital and I think that is relevant'.

"If I would have just not taken the bill, this could have all been avoided", Martin said.

Top officials arrested in alleged plot against Jordan's King
The US State Department said on Saturday that King Abdullah is a "key partner" of the US. Hamzah is the eldest son of late King Hussein and his American wife Queen Noor.

The chief said it's important for his officers to meet the community where they are, and said they need to respond in a way that meets "what our community needs".

Bradford Wankhede Langenfeld said Floyd was in cardiac arrest when he arrived and 30 minutes of efforts to revive him were unsuccessful.

Langenfeld, an emergency physician, told the jury he took over Floyd's care. According to ABC Dallas affiliate station WFAA, one of the parents who wrote a letter to the school said, "It is unfathomable to me that you felt it appropriate to force my child to watch George Floyd's murder on television in your classroom, and then move on with his day as if nothing had happened".

Dr Langenfeld told the court, "Any amount of time that a patient spends in cardiac arrest without CPR markedly decreases the chances of survival" before explaining that those chances dropped by 10 to 15 percent with each passing minute.

Under questioning by prosecutors, Langenfeld said that based on the information he had, it was "more likely than the other possibilities" that Floyd's cardiac arrest - the stopping of his heart - was caused by asphyxia, or insufficient oxygen.

Under cross-examination from Nelson, Langenfeld said Floyd's carbon dioxide levels were more than twice has high as levels in healthy person, and he agreed that that could be attributed to a respiratory problem.

Prosecutor Jerry Blackwell questions the ER doctor who pronounced Floyd dead at Hennepin County Medical Center in Minneapolis last May during Monday's testimony in the trial of former Minneapolis police officer Derek Chauvin.

Floyd's girlfriend Courtney Ross admitted that she and Floyd struggled with opioid addiction and that, in the weeks before his death, she had grown concerned that his usage was spiralling.

The measured, clinical tone of the chief stood in contrast to the emotional, sometimes wrenching testimony that prosecutors used in the first week of the trial to establish a connection with jurors and plant the seeds of their case against Chauvin, who is also charged with manslaughter.

"Simply because someone has a history of chronic opioid abuse, does that mean fentanyl can't kill them?"

One witness testified she saw Chauvin lift his right leg at one point, shifting his full weight onto Floyd's neck with his left leg.