An application for a warrant may be made by representatives of the health services in Scotland or England and Wales, where a person is found on any premises in Northern Ireland to which admission has been refused or refusal of such admission is apprehended, and there is reasonable cause to believe that the person may be subject to relevant mental health law in Scotland, or England and Wales, which permits him to be taken into custody there. The warrant authorises a constable, accompanied by a medical practitioner, to enter the premises using force if necessary and remove the person.