Rhode island constitution
Article VI: of the legislative power
Section 5

The persons of all members of the general assembly shall be exempt from arrest and their estates from attachment in any civil action, during the session of the general assembly, and two days before the commencement and two days after the termination thereof, and all process served contrary hereto shall be void. For any speech in debate in either house, no member shall be questioned in any other place, except by the ethics commission as set forth in Article III, Section 8.