(1) Whenever a member of the Garda Síochána is of opinion that a person in charge of a mechanically propelled vehicle in a public place has consumed intoxicating liquor, he may require him to provide in the prescribed manner a specimen of his breath by exhaling into an apparatus designed for the purpose of indicating the presence of alcohol in the breath.
(2) A person who refuses or fails to comply forthwith with a requisition under this section shall be guilty of an offence.
(3) A member of the Garda Síochána may arrest without warrant -
(a) a person who has been driving or attempting to drive a mechanically propelled vehicle in a public place and who, in the opinion of the member, is committing or has committed an offence under this section, or
(b) a person who is or has been in charge of a mechanically propelled vehicle in a public place with intent to drive or attempt to drive the vehicle but not driving or attempting to drive it and who, in the opinion of the member, is c