substitute
(2) The notice may be given by posting it to the chief police officer, or leaving it for the chief police officer, at the chief police officer's office—
(a) for a certificate mentioned in division 7.1 (Evidence—alcohol-related tests)—not less than 7 days before the date fixed for the hearing of the charge; or
(b) for a certificate mentioned in division 7.2 (Evidence—drug-related tests)—not less than 21 days before the date fixed for the hearing of the charge; or
(c) if the court orders a shorter period for service—not less than the shorter period.