John S. Milloy published evidence indicating that colonialists had intentionally concealed information on the spread of disease in his book A National Crime: The Canadian Government and the Residential School System, 1879 to 1986 (1999).
Evidence suggests, government policy was not to treat natives infected with tuberculosis or smallpox, and native children infected with smallpox and tuberculosis were deliberately sent back to their homes and into native villages by residential school administrators.