Qualifications for a event staff

The news reported that a volunteer interpreter at the Beppu-Oita Marathon called African guest athletes chimpanzees on her blog.

The details are;
the Japan Times

Before as a interpreter or volunteer, she has problems as a person.

It's difficult for event organizers to find out such personal problems. Unlike companies' recruiting process, they can't take time to have thorough interviews with each and every applicant.