2005 Arizona Revised Statutes - Revised Statutes §36-1909  Bill of sale required

A. A hearing aid dispenser or dispensing audiologist shall deliver a bill of sale to each person supplied with a hearing aid by the hearing aid dispenser or the dispensing audiologist or at that person's order or direction.

B. A bill of sale shall contain the hearing aid dispenser's or the dispensing audiologist's signature and shall show the address of that person's regular place of practice and the number of that person's license, a description of the make and model of the hearing aid and the amount charged. The bill of sale shall also state the serial number and the condition of the hearing aid as to whether it is new, used or rebuilt.