A senior police officer may not order the carrying out of a non-intimate forensic procedure under section 18 (1) unless satisfied--
(a) that the suspect is under arrest, and
(b) that there are reasonable grounds to believe that the suspect has committed an offence, and
(c) that there are reasonable grounds to believe that the procedure might produce evidence tending to confirm or disprove that the suspect has committed the offence referred to in paragraph (b), and
(d) that the suspect is neither a child nor an incapable person, and
(e) that the carrying out of such a procedure is justified in the circumstances.