A police officer may order the carrying out of a non–intimate forensic procedure on a serious offender if—
(a) the serious offender has been asked under section 70 (Police officer may request serious offender to consent to forensic procedure) to consent to the carrying out of the forensic procedure; and
(b) the serious offender has not consented; and
(c) the police officer has taken into account the matters set out in section 74.