He has a bit of a history;
https://www.bbc.co.uk/news/uk-scotland-34529611
"One of the principal police officers involved in the restraint of a black man who died in custody has a history of violence and racism, it has been alleged.
"The BBC has obtained statements alleging that PC Paton, 41, carried out a sustained attack on his own parents at their home in 2005, while he was off duty.
The attack was said to have left his mother, Ann Paton, now 61, unconscious, and his father, John Paton, 65, severely bruised and battered.
Police officers from the then Fife Constabulary were called to the incident, but the BBC understands PC Paton's parents elected not to pursue a complaint, after being assured by senior officers the matter would be dealt with internally."
and
"Mr Swan also alleged that the officer had admitted to being racist in the weeks since Mr Bayoh's death.
He said: "He out and out admitted that he was a racist, that he hates them, as he puts it - all the blacks."