R.I. Gen. Laws § 33-5-7: Wills conforming to laws of other states.

Any last will and testament executed outside this state in the mode prescribed by the law, either of the place where executed or of the testator’s domicile, shall be deemed to be legally executed, and shall be of the same force and effect as if executed in the mode prescribed by the laws of this state; provided, the last will and testament is in writing and subscribed by the testator.