Every 12 months every police officer has to take mandatory training. Included in that training is workplace safety, which includes issues around harassment and workplace violence. That happens every year, once a year, for every police officer. For the civilian members, it often is part of regular staff development.
I can safely say that virtually every year, every member of the service receives some further reinforcement, training, or refinement in the knowledge that they have, particularly around workplace safety and violence.