The goal of the Massachusetts Drug Supply Data Stream (MADDS) is to learn more about the local illicit drug supply to better inform public health and public safety responses. MADDS is a state-funded collaboration between Brandeis University researchers, the Massachusetts Department of Public Health, various town police departments and local community partners. Piloted in 2019 in Boston and New Bedford, MADDS currently partners with New Bedford, Quincy, Lynn, Boston, Greenfield, and Berkshire County communities, with new sites coming on board across the state.