s 28F Entry and search of premises following arrest under section 25, 25A, or 25B .
(1) An immigration officer may enter and search any premises occupied or controlled by a person arrested for an offence under section 25, 25A ... . (2) The power may be exercised— (a) only if the officer has reasonable grounds for suspecting that there is relevant evidence on the premises; (b) only to the extent that it is reasonably required for the purpose of discovering relevant evidence; and (c) subject to subsection (3), only if a senior officer has authorised it in writing. (3) The power may be exercised— (a) before taking the arrested person to a place where he is to be detained; and (b) without obtaining an authorisation under subsection (2)(c), if the presence of that person at a place other than one where he is to be detained is necessary for the effective investigation of the offence. (4) An officer who has relied on subsection (3) must inform a senior officer as soon as is practicable. (5) The officer authorising a search, or who is informed of one under subsection (4), must make a record in writing of— (a) the grounds for the search; and (b) the nature of the evidence that was sought. (6) An officer searching premises under this section may seize and retain anything he finds which he has reasonable grounds for suspecting is relevant evidence. (7) “ Relevant evidence ” means evidence, other than items subject to legal privilege, that relates to the offence in question. (8) “ Senior officer ” means an immigration officer not below the rank of chief immigration officer.