R.I. Gen. Laws § 17-9.1-9.1: Shut-in voters, serviceperson’s dependents, or peace corps registrations.

(a) Shut-in voters. Every person otherwise duly qualified to vote who by reason of illness or physical or mental disability is unable to register in person at the office of the local board may register to vote by mail.

(b) Serviceperson’s dependents. Every person otherwise duly qualified to vote who by reason of being the spouse or dependent child of a member of the armed forces of the United States in active service who is qualified to vote and is absent from this state, and is with the member of the armed forces and unable to register in person, may register to vote by mail.

(c) Peace corps registration. Every person otherwise duly qualified to register to vote who by reason of being a peace corps volunteer as defined in 22 U.S.C. § 2504, or a peace corps leader as defined in 22 U.S.C. § 2505, or the spouse or dependent child of the volunteer or leader, is absent from this state and unable to register in person and desiring to register, may register to vote by mail.