Mason v. Canada was a Supreme Court of Canada decision which assessed whether inadmissibility on security grounds for engaging in violence required a nexus to national security.

The Supreme Court of Canada’s decision clarified the interpretation of “inadmissibility on security grounds” under section 34(1)(e) of the Immigration and Refugee Protection Act (the “IRPA”). The Court ruled that to deem someone inadmissible under this provision, there must be a direct link between the acts of violence committed and a threat to national security. This decision overturned a Federal Court of Appeal which had permitted a broader interpretation that did not require such a link to national security.

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