4(1)An officer may—N.I.
(a)stop a person in a public place, and
(b)search him for the purpose of ascertaining whether he has munitions unlawfully with him or wireless apparatus with him.
(2)An officer may search a person—
(a)who is not in a public place, and
(b)whom the officer reasonably suspects to have munitions unlawfully with him or to have wireless apparatus with him.
(3)A member of Her Majesty's forces may search a person entering or found in a dwelling entered under paragraph 2.