A constable may arrest without warrant any person whom he has reasonable grounds for suspecting to have committed an offence under section 17 above.

If a justice of the peace is by written information on oath satisfied that there is reasonable ground for suspecting that a person who is liable to be arrested under subsection (1) above is to be found on any premises, he may grant a warrant authorising any constable to enter, if need be by force, the premises named in the warrant for the purposes of searching for and arresting that person.

Section 8 of the M1Police and Criminal Evidence Act 1984 (power of justice to authorise entry and search of premises) shall have effect as if the reference in subsection (1) of that section to a serious arrestable offence included a reference to an offence under section 17 above.