R.I. Gen. Laws § 31-41.2-5: Hearings.

Evidence from an automated traffic violation detection system shall be considered substantive evidence in the prosecution of all civil traffic violations. Evidence from an automated traffic violation detection system approved by the director 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 and all defenses cognizable at law shall be available to the individual who receives the summons commencing a prosecution under this chapter.