18.—(1) Every member of a police force shall in accordance with the directions of the chief officer have his fingerprints taken.
(2) Fingerprints of members of a police force taken in accordance with paragraph (1) shall be kept separate from the fingerprints of persons whose fingerprints have been taken otherwise than in accordance with that paragraph.
(3) The fingerprints of a member of a police force taken in accordance with paragraph (1) and all copies and records thereof shall be destroyed on his ceasing to be a member of that force, except that, where by reason of a statutory transfer he becomes a member of another force, his fingerprints and all copies and records thereof shall be transferred to the chief officer of that other police force.