Dame Cressida Dick said 147 of her colleagues have been coughed at and another 51 spat at by people claiming to have coronavirus.
Novlett Robyn Williams, who was commended for her work after the Grenfell Tower disaster, was sentenced to 200 hours of community service.
Detective Sergeant Darren Barker started with the Metropolitan Police in March 1992 and was described by a colleague as an “extremely talented detective”.