It's elementary: Teachers play an invaluable role in our lives and in our kids' lives. But how good is the system at protecting you, if there's a problem in the classroom? In a months-long investigation, we find out how serious complaints about teacher conduct are handled across Canada, and reveal that in most provinces, teacher discipline is so rare, slow and secretive that often teachers who have been disciplined continue to teach while parents remain in the dark. We expose how the lack of transparency and efficiency in parts of Canada could put students at risk, and find out which provinces get a failing grade.