3. Compliance with the requirements of a movement restriction condition which has been made in respect of a person may be monitored by the following methods–
(a)radio and electronic monitoring of that person’s presence at or absence from a specified place by means of a regular radio signal transmitted by a transmitter device attached to the person with the transmitter signal received by a radio receiving and monitoring device located at a specified place, with the relevant information received and processed by that radio receiving and monitoring device periodically passed by telephone line to a central computer at a monitoring centre;
(b)radio and electronic monitoring of that person’s presence at or absence from a specified place by a mobile receiver which receives radio signals transmitted by a transmitter device attached to the person;
(c)monitoring that person’s whereabouts by periodic telephone calls to the person at a specified place with a secondary verification of the identity of the person by verification against stored personal details; and
(d)monitoring that person’s whereabouts by random visits to a specified place during periods when the person is required to be at such a place (or, as the case may be, required not to be there) under the movement restriction condition,
but the methods of monitoring in (b), (c) or (d) shall not be used unless it is not reasonably practicable to use the method described in (a) except that the method referred to in (c) may be used as a back up method of monitoring where method (a) is also being used.