The surviving parent did. Read the article.
You are correct that they should've known. No conscientious professional in education accuses a child who's upset of using drugs....they talk to them in private.
It used to be that situations such as this went through school nurses. Now very few schools have them; too expensive with all of the other priorities, of course.
Fire 'em all. They just might've been within their rights to be so insensitive. But no caring parent would want these administrators anywhere near their kids if crisis management is necessary.