It is a requirement for the proper operation of a breath analysing instrument that a person authorised under section 85(7) of the Act to operate a breath analysing instrument—
(a) does not require a person to provide a breath sample for analysis until the authorised person is satisfied that the person has not consumed any alcohol for a period of at least 15 minutes before the analysis; and
(b) provides a fresh mouthpiece for use by each person required to provide a breath sample; and
(c) uses only a mouthpiece which, until required for taking the breath sample, has been kept in a sealed container.