23.—(1) A charging scheme may confer powers on an authorised person to enter a motor vehicle whilst on a road where the authorised person has reasonable grounds for suspecting that—
(a)any equipment required by a charging scheme to be carried in or fitted to the motor vehicle while it is on a road designated by the charging scheme and in respect of which road user charges have been imposed has been interfered with, or its functioning has been interfered with, by a person who intends to avoid payment of, or being identified as having failed to pay, a road user charge imposed by the charging scheme; or
(b)there is in the motor vehicle a false document which has been made or used by a person who intends to avoid payment of, or being identified as having failed to pay, such a road user charge.
(2) The power conferred by paragraph (1) must not be exercised by an authorised person who is not a constable except in the presence of a constable.