R.I. Gen. Laws § 12-30-8: Funding.

The cost of maintaining a protected criminal witness in custody shall be paid by the attorney general from funds appropriated to his or her office for that purpose. Expenditures shall be monitored by the witness protection review board, which shall determine an appropriate budget for the maintenance of each witness. In determining that budget, the board shall consider the standard of living provided for inmates at the adult correctional institutions.