R.I. Gen. Laws § 31-19-21

In every sale of a used bicycle, the seller shall issue a bill of sale which shall contain on it the date of sale, the seller’s and buyer’s names and addresses, the manufacturer’s name, model, and serial numbers where this information is available on the bicycle. Where any of this information is missing, the seller must obtain a registration number from the local police. Violations of this section are subject to fines enumerated in § 31-41.1-4.