(a) An unused official prescription form is invalid and the practitioner or another person acting on behalf of the practitioner must return the unused form to the board with an appropriate explanation not later than the 30th day after the date:(1) the practitioner's license to practice, DEA number is canceled, revoked, suspended, denied, or surrendered or amended to exclude the handling of all Schedule II controlled substances; or(2) the practitioner is deceased.(b) An individual who is an institutional practitioner must return an unused official prescription form to the administrator of the hospital or other training institution upon completion or termination of the individual's training at the hospital or institution. The administrator must return an unused official prescription form to the board not later than the 30th day after the date the individual completes or terminates all training programs.(c) No individual may continue to use an official prescription form issued under an institutional practitioner's DEA number or similar number after the individual has been properly and individually licensed as a practitioner by the appropriate state health regulatory agency.