Discovery. Upon written demand of the defendant at least 14 days before a contested hearing, filed with the court and served on the office of the prosecuting authority assigned to the court in which the infraction is filed, the plaintiff's lawyer shall at least 7 days before the hearing provide the defendant or the defendant's lawyer with a copy of the citing officer's sworn statement if it will be offered into evidence at the hearing and with the names of any witnesses not identified in the citing officer's sworn statement. If the prosecuting authority provides the citing officer's sworn statement less than 7 days before the hearing but not later than one day before the hearing, the citing officer's sworn statement shall be suppressed only upon a showing of prejudice in the presentation of the defendant's case. If the prosecuting authority, without reasonable excuse or justification, fails to provide the citing officer's sworn statement, the statement shall be suppressed. No other discovery shall be required
. Neither party is precluded from investigating the case, and neither party shall impede another party's investigation. A request for discovery pursuant to this section shall be filed on a separate pleading.