Peer pressure is a wonderful thing..... I've refused to let a medical team work a race track in the middle of a race day because in between races riders were riding the track without helmets, protective gear (one idiot riding in shorts, no gear, no t-shirt and no shoes!) and being obnoxious/rude/aggresive when reminded to do so. It all kicked off and the troublemakers were soon made suitably unpopular. The race director fully supported my point of view.