1.  Unfair and deceptive practices.  Engaging in unfair or deceptive practices as defined by the rules established by the board or violating the code of ethics adopted and published by the board, including selling or causing to be sold a hearing aid to a person who has not been given tests such as pure tone, air and bone audiometry or other hearing assessments as determined by the board. The results of these tests must be permanently filed;  

2.  Negligence.  Incompetence, negligence or neglect in the conduct of the practice of dealing in and fitting of hearing aids, including, but not limited to, the improper fitting of a hearing aid, the sale of a hearing aid to a person with normal hearing, making an ear mold impression or fitting an ear mold without prior inspection of the external ear canal, making an ear mold impression or fitting an ear mold after prior inspection revealed the presence of, or impacted, cerumen in the ear canal, the failure to indicate the need for medical or audiological evaluation when the prospective purchaser's history reveals a probable risk of disease or progressive hearing impairment, the failure to make the required medical referrals, the incorrect reporting of hearing test results to a person, the failure to be present to fit the final hearing aid in the ear of the purchaser and the tampering with a satisfactorily performing hearing aid owned by a purchaser or potential purchaser to cause that hearing aid to no longer perform correctly; or  

3.  Prohibited conduct.  A violation of section 17311.