(a) The commissioner may refuse to issue a license or may suspend or revoke the license of any licensee or take any of the actions set forth in § 19a-17 in circumstances which have endangered or are likely to endanger the health, welfare, or safety of the public. Such circumstances include but are not limited to the following:

(1) Obtaining a license by means of fraud or material misrepresentation or engaging in fraud or material deception in the course of professional services or activities;

(2) Violation of professional conduct guidelines or code of ethics as established by regulations adopted by the department;

(3) Violation of any provision of this chapter or regulations hereunder or § 20-404;

(4) Physical or mental illness or emotional disorder or loss of motor skill, including but not limited to, deterioration through the aging process;

(5) Abuse or excessive use of drugs, including alcohol, narcotics or chemicals;

(6) Illegal, incompetent or negligent conduct in his practice.

(b) The commissioner may order a license holder to submit to a reasonable physical or mental examination if his physical or mental capacity to practice safely is the subject of an investigation. Said commissioner may petition the superior court for the judicial district of Hartford to enforce such order or any action taken pursuant to § 19a-17.