R.I. Gen. Laws § 11-47-57: “Mace” or similar substances.

Any person eighteen (18) years of age or over may carry on his or her person and use, unless otherwise prohibited by law, any non-lethal noxious substance or liquid for his or her protection or the protection of others; however, the use of any non-lethal noxious substance or liquid for any other purpose shall be punishable by a fine of not more than twenty-five dollars ($25.00).