For example in Ishaq v Canada (Citizenship and Immigration), 2015 FC 156, (a case about whether a woman could wear her niqab during a citizenship ceremony), six public interest groups — including the Ontario Human Rights Commission, the
Canadian Civil Liberties Association and the National Council of
Canadian Muslims — were refused permission to intervene, as the court determined that they could not advance their proposed arguments without social science
evidence to back them up; nor could the court take judicial notice (facts and materials are
accepted on a common sense basis without being formally admitted in
evidence) of any of the facts necessary to support the arguments.