Section 18: Detention opening, etc., of postal articles

(1) A mail bag may be detained or reopened under the authority of the Postmaster-General.
(2) After a postal article has been delivered to the post office, no person employed by or under the Postmaster-General shall, except as otherwise prescribed, open or return the article to any person or procure or suffer the article to be opened or returned unless he is authorised to do so in writing by the Postmaster-General.
(3) A person who contravenes the provisions of subsection (2) of this section commits an offence under this Act and is on conviction liable to imprisonment for a term of twenty-one years.
(4) The Postmaster-General may, in the interest of justice or in any individual circumstance which appears to him to warrant such a course, grant authority for opening or returning any specified postal article.