Following its visit to Canada in June, the UN Working Group on arbitrary detention expressed concern at the detention of foreigners certified under the Immigration and Refugee Protection Act as posing a threat to national security. The UN experts considered that this procedure undermines detainees’ rights, in particular the rights to a fair hearing, to challenge the evidence used against them, not to incriminate themselves and to judicial review of their detention. The group also raised concerns about its application only to foreigners.