R.I. Gen. Laws § 30-13-50: Refusal to appear or testify.

Any person not subject to this code who:

(1) Has been duly subpoenaed to appear as a witness or to produce books and records before a military court or before any military or civil officer designated to take a deposition to be read in evidence before a military court;

(2) Has been duly paid or tendered the fees and mileage of a witness at the rates allowed to witnesses attending the superior courts of the state; and

(3) Willfully neglects or refuses to appear, or refuses to qualify as a witness or to testify or to produce any evidence which that person may have been legally subpoenaed to produce;

is guilty of an offense against the state and a military court may punish that person in the same manner as the civil courts of the state.