The commissioner may, after a hearing in conformance with applicable provisions of the Maine Administrative Procedure Act, suspend or revoke a license issued under this chapter. The following are grounds for denial, suspension or revocation of a license:
1. Fraud or deceit. The practice of fraud or deceit in obtaining a license under this chapter or in the performance of services within the scope of the license issued;
2. Conviction of certain crimes. Conviction of a crime that relates directly to the practice for which the person is licensed or conviction of a crime for which incarceration for one year or more may be imposed;
3. Violation of chapter or rule. A violation of this chapter or a rule adopted by the commissioner;
4. Aiding or abetting unlicensed practice. Aiding or abetting the practice of displaying or discharging fireworks by a person not duly licensed under this chapter; or
5. Incompetence. Incompetence in the practice of displaying or discharging fireworks. A licensee is considered incompetent in the practice if the licensee has:
A. Engaged in professional conduct that evidences a lack of ability or fitness to perform the duties for which that licensee is licensed; or
B. Engaged in professional conduct that evidences a lack of knowledge of, or inability to apply, appropriate principles or skills to carry out the practice for which that licensee is licensed.