Arradondo, the city's first Black police chief, fired Chauvin and three other officers the day after Floyd's death.
A key witness in the trial of former Minneapolis police officer Derek Chauvin invoked the Fifth Amendment.
Giving evidence to the murder trial of officer Derek Chauvin, Police Chief Medaria Arradondo said continuing to kneel on Mr Floyd's neck once he was handcuffed behind his back and lying on his stomach was "in no way, shape or form" part of department policy or training.
Stiger said officers were justified in using force initially as Floyd resisted their efforts to put him into a police vehicle, but that once Floyd was on the ground and stopped resisting, the officers "should have slowed down or stopped their force as well".
Today a police chief has testified that the force used during Mr Floyd's arrest was a "direct violation" of police conduct.
Chauvin, who is white, has pleaded not guilty to murder and manslaughter charges.
"I would say no", Lieutenant Mercil testified.
Chauvin's lawyer contends that Floyd, an African American, died from underlying health issues and that Chauvin followed his police training in the way in which the 46-year-old Floyd was arrested.
Eric Nelson left and Derek Chauvin right listen as Judge Peter Cahill presides in the murder trial Credit Court TV
He told the court Chauvin had failed in his duty to render first aid before the ambulance arrived, and that he violated policy requiring officers to de-escalate tense situations with no or minimal force if they can.
The officers also rebuffed offers of help from an off-duty Minneapolis firefighter who wanted to administer aid or tell officers how to do it. "But what we train is using one arm or two arms, to do a neck restraint", she said.
Mercil testified that a neck restraint created to render a suspect unconscious is authorised only when the suspect is actively and aggressively resisting.
"Just because they're speaking doesn't mean they're breathing adequately", Mackenzie testified when a prosecutor asked if a person can speak if they cannot breath.
Yang said police are trained to use principles such as neutrality, respect and trust in crisis intervention situations, and how to spot and interact with suspects going through a crisis.
The friend, Morries Hall, was in the auto with Floyd when police arrived.
Nelson told Cahill he planned to ask Hall whether he gave Floyd any controlled substances and why Hall left Minnesota immediately after the incident.
The judge instructed defense attorney Eric Nelson to prepare written questions for Hall's attorney to review. An autopsy conducted by the Hennepin County Medical Examiner found fentanyl and methamphetamine in his system.