(1)In the course of an investigation into whether a person has committed an offence under section 4 or 5 of this Act a constable may, subject to the following provisions of this section and section 9 of this Act, require him—
(a)to provide two specimens of breath for analysis by means of a device of a type approved by the Secretary of State, or
(b)to provide a specimen of blood or urine for a laboratory test.
(2)A requirement under this section to provide specimens of breath can only be made at a police station.
(3)A requirement under this section to provide a specimen of blood or urine can only be made at a police station or at a hospital; and it cannot be made at a police station unless—
(a)the constable making the requirement has reasonable cause to believe that for medical reasons a specimen of breath cannot be provided or should not be required, or
(b)at the time the requirement is made a device or a reliable device of the type mentioned in subsection (1)(a) above is not available at the police station or it is then for any other reason not practicable to use such a device there, or
(c)the suspected offence is one under section 4 of this Act and the constable making the requirement has been advised by a medical practitioner that the condition of the person required to provide the specimen might be due to some drug;
but may then be made notwithstanding that the person required to provide the specimen has already provided or been required to provide two specimens of breath.
(4)If the provision of a specimen other than a specimen of breath may be required in pursuance of this section the question whether it is to be a specimen of blood or a specimen of urine shall be decided by the constable making the requirement, but if a medical practitioner is of the opinion that for medical reasons a specimen of blood cannot or should not be taken the specimen shall be a specimen of urine.
(5)A specimen of urine shall be provided within one hour of the requirement for its provision being made and after the provision of a previous specimen of urine.
(6)A person who, without reasonable excuse, fails to provide a specimen when required to do so in pursuance of this section is guilty of an offence.
(7)A constable must, on requiring any person to provide a specimen in pursuance of this section, warn him that a failure to provide it may render him liable to prosecution.