(1)For the purposes of section 191, the requirements of this section are met in relation to the material obtained under a warrant if—
(a)the selection of any of the material obtained under the warrant for examination is carried out only for the specified purposes (see subsection (2)),
(b)the selection of any of the material for examination is necessary and proportionate in all the circumstances, and
(c)where any such material is protected material, the selection of the material for examination meets any of the selection conditions (see subsection (3)).
(2)The selection of material obtained under the warrant for examination is carried out only for the specified purposes if the material is selected for examination only so far as is necessary for the operational purposes specified in the warrant in accordance with section 183.
In this subsection “specified in the warrant” means specified in the warrant at the time of the selection of the material for examination.
(3)The selection conditions referred to in subsection (1)(c) are—
(a)that the selection of the protected material for examination does not breach the prohibition in subsection (4);
(b)that the person to whom the warrant is addressed reasonably considers that the selection of the protected material for examination would not breach that prohibition;
(c)that the selection of the protected material for examination in breach of that prohibition is authorised by subsection (5);
(d)that the selection of the protected material for examination in breach of that prohibition is authorised by a targeted examination warrant issued under Part 5.
(4)The prohibition referred to in subsection (3)(a) is that the protected material may not at any time be selected for examination if—
(a)any criteria used for the selection of the material for examination are referable to an individual known to be in the British Islands at that time, and
(b)the purpose of using those criteria is to identify protected material consisting of communications sent by, or intended for, that individual or private information relating to that individual.
It does not matter for the purposes of this subsection whether the identity of the individual is known.
(5)The selection of protected material (“the relevant material”) for examination is authorised by this subsection if—
(a)criteria referable to an individual have been, or are being, used for the selection of material for examination in circumstances falling within subsection (3)(a) or (b),
(b)at any time it appears to the person to whom the warrant is addressed that there has been a relevant change of circumstances in relation to the individual (see subsection (6)) which would mean that the selection of the relevant material for examination would breach the prohibition in subsection (4),
(c)since that time, a written authorisation to examine the relevant material using those criteria has been given by a senior officer, and
(d)the selection of the relevant material for examination is made before the end of the permitted period (see subsection (7)).
(6)For the purposes of subsection (5)(b) there is a relevant change of circumstances in relation to an individual if—
(a)the individual has entered the British Islands, or
(b)a belief by the person to whom the warrant is addressed that the individual was outside the British Islands was in fact mistaken.
(7)In subsection (5)—
“senior officer”, in relation to a warrant addressed to the head of an intelligence service, means a member of the intelligence service who—
is a member of the Senior Civil Service or a member of the Senior Management Structure of Her Majesty’s Diplomatic Service, or
holds a position in the intelligence service of equivalent seniority to such a member;
“the permitted period” means the period ending with the fifth working day after the time mentioned in subsection (5)(b).
(8)In a case where the selection of protected material for examination is authorised by subsection (5), the person to whom the warrant is addressed must notify the Secretary of State that the selection is being carried out.
(9)In this Part, “protected material” means any material obtained under the warrant other than material which is—
(a)equipment data;
(b)information (other than a communication or equipment data) which is not private information.