9. After section 45 of the 1957 Act insert—
(1) A service policeman may arrest a person whom he reasonably suspects of being about to commit an offence under any provision of Part 1 of this Act.
(2) Subsection (7) of section 45 of this Act applies in relation to the power of arrest conferred by this section as it applies in relation to the power of arrest conferred by that section.
(3) Where a person is arrested under this section—
(a)the arrest must be reported as soon as practicable to his commanding officer; and
(b)he may be kept in naval, military or air-force custody until such time as a service policeman is satisfied that the risk of his committing the offence concerned has passed.”