316. (1) An accused who is alleged to have published a defamatory libel may, at any stage of the proceedings, adduce evidence to prove that the matter that is alleged to be defamatory was contained in a paper published by order or under the authority of the Senate or House of Commons or a legislature of a province.
(2) Where at any stage in proceedings referred to in subsection (1) the court, judge, justice or provincial court judge is satisfied that the matter alleged to be defamatory was contained in a paper published by order or under the authority of the Senate or House of Commons or a legislature of a province, he shall direct a verdict of not guilty to be entered and shall discharge the accused.
(3) For the purposes of this section, a certificate under the hand of the Speaker or clerk of the Senate or House of Commons or a legislature of a province to the effect that the matter that is alleged to be defamatory was contained in a paper published by order or under the authority of the Senate, House of Commons or legislature of a province, as the case may be, is conclusive evidence thereof. [R.S., c.C-34, s.280.]