In any proceedings for an offence under section 5 of this Act, the court shall, subject to section 10(5) thereof, have regard to any evidence which may be given of the proportion or quantity of alcohol or of any drug which was contained in the blood or present in the body of the accused, as ascertained by analysis of a specimen of blood taken from him with his consent by a medical practitioner, or of urine provided by him, at any material time; and if it is proved that the accused, when so requested by a constable at any such time, refused to consent to the taking of or to provide a specimen for analysis, his refusal may, unless reasonable cause therefor is shown, be treated as supporting any evidence given on behalf of the prosecution, or as rebutting any evidence given on behalf of the defence, with respect to his condition at that time.
A person shall not be treated for the purposes of subsection (1) above as refusing to provide a specimen unless—
(a) he is first requested to provide a specimen of blood, but refuses to do so ;
(b) he is then requested to provide two specimens of urine within one hour of the request, but fails to provide them within the hour or refuses at any time within the hour to provide them; and
(c) he is again requested to provide a specimen of blood, but refuses to do so.
The first specimen of urine provided in pursuance of a request under subsection (2)(b) above shall be disregarded for the purposes of subsection (1) above.