Two San Diego teens investigated their high school foundation’s finances. Then one got called in to the principal.

Kevin Wang, a 17-year-old senior at Canyon Crest Academy, was bored over the summer and needed something to do. Then he remembered something that had bothered him back when he was a business officer for one of the school’s robotics teams: The school’s nonprofit foundation and main fundraising arm, the Canyon Crest Academy Foundation, was taking a bunch of money from his team. The foundation ...