Indemnity of witnesses.

Any person who shall have been concerned in gaming leading to, and who shall be examined as a witness before a magistrate in respect of, the trial of any person for a breach of any of the provisions of this Act and who upon such examination shall make a true and faithful discovery to the best of his knowledge of all things as to which he shall be so examined, and who shall thereupon receive from the said magistrate a certificate to that effect, shall be freed from all prosecution, under the provisions of this Act for anything done before that time in respect of such gaming.