Many children in schools and daycares across Canada are likely being exposed to dangerous levels of lead in their drinking water and don’t know it, because most provinces aren’t requiring comprehensive testing at the taps, according to a collection of provincial studies and internal briefing material. The internal briefing material included memos and other advice prepared for high-ranking government officials in several provinces. These documents were released through freedom of information legislation to Global News as part of a joint year-long investigation into drinking water in partnership with Concordia University’s Institute for Investigative Journalism and other media organizations.