Persons by whom tests shall be conducted
9.—(1)  A test shall be conducted by a person appointed by the Deputy Commissioner of Police.
(2)  The Deputy Commissioner of Police may appoint such other person as he thinks fit to supervise or observe the conduct of the test.
(3)  A person appointed under paragraph (2) to supervise or observe a test may be present in or on the vehicle which is being used in the conduct of the test.