Devon and Cornwall Police has been fined £234,500 for health and safety breaches over a case where a mentally ill man died after a belt was put around his face while he was in custody.
The force were sentenced at Bristol Crown Court in relation to the death of Thomas Orchard, who collapsed in custody then died in hospital days after his death in October 2012.
Officers had denied breaching the Health and Safety at Work Act over the restraints death of the 32-year-old man, who suffered from paranoid schizophrenia.
However the chief constable of the force admitted the breaches in a landmark conviction last year.
Devon and Cornwall Police accepted it had failed to ensure non-employees, including Mr Orchard, were not exposed to risks in connection with the Emergency Response Belt (ERB).
A court had earlier seen harrowing footage of the church caretaker being detained in a police cell.
After his arrest the ERB had been put across his mouth and nose in a police cell in Exeter for five minutes while he was in a prone position, interfering with his breathing.
Orchard was left motionless in his cell after police strapped it across his face, at times covering both his nose and mouth, and ultimately starving him of oxygen.
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He was found in cardiac arrest 12 minutes after being released from the restaint and died in hospital a week later from brain damage and asphyxia.
Experienced custody sergeant Jan Kingshott, 44, and civilian detention officers Simon Tansley, 38, and Michael Marsden, 55, denied unlawful act manslaughter.
The trio from Devon and Cornwall Police also denied gross negligence manslaughter over the incident.
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The footage of the restraint at Heavitree Road Police Station in Exeter, Devon, was released to be shown publicly after a challenge by the press.
The CCTV showed the moments Orchard was arrested, taken into custody and carried around the police station.
A final video also shows him being retrained face down on the floor of a cell with a belt around his face by police officers, who then remove the belt and rush from the cell.
The court earlier heard Orchard had been arrested on suspicion of a public order offence in the streets of Exeter.
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He had actually been suffering from a relapse of his longstanding mental illness of paranoid schizophrenia, a severely debilitating psychiatric condition.
A court earlier heard he was restrained with the webbing belt, known among the force as an Emergency Response Belt, for more than five minutes.
"At the same time, no one of those directly responsible took sufficient care to see that he was breathing properly - or even perhaps at all towards the end of those events," prosecutor Mark Heywood QC told the court when the case opened in 2016.
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"Instead, he was left in a locked cell, under more remote observation for a further twelve minutes until his true condition was discovered. By then, it was too late."
The court heard "placid" Orchard had suffered with mental health issues since his teens, and had been hospitalised multiple times.
At the time of his arrest he had been living in supported housing in Exeter and his mental health was in serious decline.
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After going to church for communion he had attacked a man in Exeter city centre was arrested by seven police officers - none of whom were involved in the trial concerning his restraint in custody.
Witnesses had told the hearings he had tried to bite officers, and the jury was shown footage of him being restrained and carried by officers.
A post-mortem examination found Mr Orchard died from a severe hypoxic-ischemic brain injury as a result of going into cardiac arrest.
