The entry or search of premises under a warrant is unlawful unless it complies with this section and section 28K.
If an immigration officer applies for a warrant, he must—
(a) state the ground on which he makes the application and the provision of this Act under which the warrant would be issued;
(aa) if the application is for a warrant authorising entry and search on more than one occasion, state the ground on which the officer applies for such a warrant, and whether the officer seeks a warrant authorising an unlimited number of entries, or (if not) the maximum number of entries desired;
(b) specify the matters set out in subsection (2A) below; and
(c) identify, so far as is practicable, the persons or articles to be sought.
The matters which must be specified pursuant to subsection (2)(b) above are—
(a) if the application relates to one or more sets of premises specified in the application, each set of premises which it is desired to enter and search;
(b) if the application relates to any premises occupied or controlled by a person specified in the application—
(i) as many sets of premises which it is desired to enter and search as it is reasonably practicable to specify;
(ii) the person who is in occupation or control of those premises and any others which it is desired to enter and search;
(iii) why it is necessary to search more premises than those specified under sub-paragraph (i);
(iv) why it is not reasonably practicable to specify all the premises which it is desired to enter and search.
In Northern Ireland, an application for a warrant is to be supported by a complaint in writing and substantiated on oath.
Otherwise, an application for a warrant is to be made ex parte and supported by an information in writing or, in Scotland, evidence on oath.
The officer must answer on oath any question that the justice of the peace or sheriff hearing the application asks him.
A warrant shall authorise an entry on one occasion only unless it specifies that it authorises multiple entries .
If it specifies that it authorises multiple entries, it must also specify whether the number of entries authorised is unlimited, or limited to a specified maximum.
A warrant must specify—
(a) the name of the person applying for it;
(b) the date on which it is issued;
(c) each set of premises to be searched, or (in the case of an all premises warrant) the person who is in occupation or control of premises to be searched, together with any premises under the person's occupation or control which can be specified and which are to be searched; and
(d) the provision of this Act under which it is issued.
A warrant must identify, so far as is practicable, the persons or articles to be sought.
Two copies must be made of a warrant which specifies only one set of premises and does not authorise multiple entries; and as many copies as are reasonably required may be made of any other kind of warrant.
The copies must be clearly certified as copies.
All premises warrant" means a warrant issued in response to an application of the kind mentioned in section 24E(6)(b), 28D(1A)(b) or 28FB(1A)(b) or paragraph 25A(6AA)(b) of Schedule 2.
References in this section to a warrant authorising multiple entries is to a warrant of the kind mentioned in section 24E(8), 28D(1C) or 28FB(3A) or paragraph 25A(6AC) of Schedule 2.
"Warrant" means a warrant to enter and search premises issued to an immigration officer under this Part or under paragraph 17(2) or 25A(6A) of Schedule 2.