29.—(1) Where a relevant organism is being imported or exported, or has been imported or brought to a place for the purpose of being exported, a designated customs official who suspects that the relevant organism is a specimen may require a person possessing or having control, or appearing to possess or have control, of that relevant organism to furnish relevant proof.
(2) Until relevant proof is provided to the satisfaction of the designated customs official, the designated customs official may detain the relevant organism for not more than five working days.
(3) Any relevant organism detained under this article may, if the designated customs official considers it appropriate, be transferred to an enforcement officer, who may hold the relevant organism for a period not longer than the remainder of the detention period referred to in paragraph (2).
(4) A relevant organism held by an enforcement officer under paragraph (3) must be held in contained holding.
(5) In this article, and in article 30, “relevant proof” in relation to the importation or exportation of a relevant organism, means proof—
(a)that the relevant organism is not a specimen; or
(b)that such importation or exportation (as the case may be) is or was authorised by a permit or a licence, or (if it would otherwise be unlawful) is lawful by virtue of a defence under articles 15 to 18.