Section 21 Canadian Evidence Act 1985 is about Proclamations, etc., of Governor General. It is under Documentary Evidence of Part I of the act. The Evidence Act of Canada is an Act respecting witnesses and evidence.
Proclamations, etc., of Governor General
Evidence of any proclamation, order, regulation or appointment, made or issued by the Governor General or by the Governor in Council, or by or under the authority of any minister or head of any department of the Government of Canada and evidence of a treaty to which Canada is a party, may be given in all or any of the following ways:
(a) by the production of a copy of the Canada Gazette, or a volume of the Acts of Parliament purporting to contain a copy of the treaty, proclamation, order, regulation or appointment, or a notice thereof;
(b) by the production of a copy of the proclamation, order, regulation or appointment, purporting to be published by the Queen’s Printer;
(c) by the production of a copy of the treaty purporting to be published by the Queen’s Printer;
(d) by the production, in the case of any proclamation, order, regulation or appointment made or issued by the Governor General or by the Governor in Council, of a copy or extract purporting to be certified to be true by the clerk or assistant or acting clerk of the Queen’s Privy Council for Canada; and
(e) by the production, in the case of any order, regulation or appointment made or issued by or under the authority of any minister or head of a department of the Government of Canada, of a copy or extract purporting to be certified to be true by the minister, by his deputy or acting deputy, or by the secretary or acting secretary of the department over which he presides.