The commissioner may, after a hearing in conformance with applicable provisions of the Maine Administrative Procedure Act, suspend or revoke a permit issued under this subchapter. The following are grounds for suspension or revocation of a permit:
1. Fraud or deceit. The practice of fraud or deceit in obtaining a permit under this subchapter or in the performance of services within the scope of the permit issued;
2. Conviction of certain crimes. Conviction of a crime that relates directly to the practice for which the person is permitted, or conviction of any crime for which incarceration for one year or more may be imposed;
3. Violation of subchapter or rule. Any violation of this subchapter or any rule adopted by the commissioner; and
4. Incompetence. Incompetence in the practice of storing, using or transporting explosives. A permittee is deemed incompetent in the practice if the permittee has:
A. Engaged in professional conduct that evidences a lack of ability or fitness to perform the duties for which the person is permitted; or
B. Engaged in professional conduct that evidences a lack of knowledge or an inability to apply appropriate principles or skills to carry out the practice for which the person is permitted.