(1) The power conferred by an authorisation under section 44(1) or (2) -
(a) may be exercised only for the purpose of searching for articles of a kind which could be used in connection with terrorism, and
(b) may be exercised whether or not the constable has grounds for suspecting the presence of articles of that kind.
(2) A constable may seize and retain an article which he discovers in the course of a search by virtue of section 44(1) or (2) and which he reasonably suspects is intended to be used in connection with terrorism.
(3) A constable exercising the power conferred by an authorisation may not require a person to remove any clothing in public except for headgear, footwear, an outer coat, a jacket or gloves.
(4) Where a constable proposes to search a person or vehicle by virtue of section 44(1) or (2) he may detain the person or vehicle for such time as is reasonably required to permit the search to be carried out at or near the place where the person or vehicle is stopped.