s 13 How special authorisation to be given
13.—(1) A special authorisation by the Commissioner must be in writing, or be confirmed in writing as soon as practicable after being given orally. (2) The Commissioner must cause notice of every special authorisation the Commissioner grants to be given —(a) to every police officer authorised to exercise the special powers specified in that authorisation; and (b) to any other person who, in the Commissioner’s opinion, ought to have notice of the authorisation. (3) Without limiting subsection (2)(b), notice to the public of the granting of a special authorisation may be given in all or any of the following ways: (a) by causing it to be published in the daily newspapers circulating in Singapore in all the official languages; (b) by causing it to be broadcast over the radio and television and in the manner prescribed, if any; (c) by causing it to be published in any other manner that the Commissioner considers will secure adequate publicity for the granting of the special authorisation. (4) A special authorisation may be revoked at any time by the Commissioner by instrument in writing; and the Commissioner must give notice, or cause the giving of notice, of the revocation in the same manner in which the special authorisation was first given. (5) To avoid doubt, the non‑publication of any notice of the granting of a special authorisation or its revocation in the manner described in subsection (3) or (4) does not affect the validity of the special authorisation or revocation, as the case may be.