R.I. Gen. Laws § 11-47-28
Every officer authorized to make an arrest may, without complaint and warrant, arrest any person who has in his or her possession any firearm whenever the officer has reasonable ground to suspect that the person possesses or is using or is carrying the firearm contrary to law. Any person so arrested may be detained a reasonable time, not exceeding twenty-four (24) hours, for the purpose of making an investigation concerning the person, but no person so arrested shall be detained longer than twenty-four (24) hours without complaint being made against him or her before some proper court or justice. If the officer making the arrest shall at any time within the twenty-four (24) hours satisfy himself or herself that there is no ground for making a criminal complaint against the person, he or she shall be discharged from custody.
R.I. Gen. Laws § 11-47-28