(1) Where under this Part a designated doctor or designated nurse has taken a specimen of blood from a person or has been provided by the person with a specimen of his or her urine, the doctor or nurse shall divide the specimen into 2 parts, place each part in a container which he or she shall immediately seal and complete the form prescribed for the purposes of this section.

(2) Where a specimen of blood or urine of a person has been divided into 2 parts pursuant to subsection (1), a member of the Garda Síochána shall offer to the person one of the sealed containers together with a statement in writing indicating that he may retain either of the containers.

(3) As soon as practicable after subsection (2) has been complied with, a member of the Garda Síochána shall cause to be forwarded to the Bureau the completed form referred to in subsection (1), together with the relevant sealed container or, where the person has declined to retain one of the sealed containers, both relevant sealed containers.

(4) In a prosecution for an offence under this Part or under section 49 or 50 of the Principal Act, it shall be presumed until the contrary is shown that subsections (1) to (3) have been complied with.