R.I. Gen. Laws § 31-41.3-9: Hearings.

Evidence from an automated school-zone-speed-enforcement system shall be considered substantive evidence in the prosecution of all civil traffic violations. Evidence from an automated school-zone-speed-enforcement system approved by the director of the department of transportation shall be admitted without further authentication and such evidence may be deemed sufficient to sustain a civil traffic violation. In addition to any other defenses as set forth herein, any defenses cognizable at law, with the exception of that available under § 31-41.1-7, shall be available to the individual who receives the citation commencing a prosecution under this chapter.