(1) Where a person (in this section referred to as the arrested person) arrested under section 49(4) of the Principal Act or section 28(3)(a) of this Act has been brought to a Garda station a member of the Garda Síochána may do either or both of the following -
(a) require the arrested person to provide in the prescribed manner a specimen of his breath by exhaling into an apparatus designed for showing the concentration of alcohol in the breath or blood or into a receptacle designed for preserving the specimen for subsequent analysis,
(b) require the arrested person either to permit a designated registered medical practitioner to take from the arrested person a specimen of his blood or, if the arrested person so opts, to provide for the designated registered medical practitioner a specimen of the arrested person's urine in accordance with the prescribed procedure.
(2) Notwithstanding subsection (1), when an arrested person who opted to provide in accordance with the prescribed p