A commission may be suspended or revoked after due investigation and recommendation by the board to the director of the department of labor and industries for the incompetence or untrustworthiness of the holder thereof, or for willful falsification of any matter or statement contained in his or her application or in a report of any inspection. A person whose commission has been suspended or revoked, except for untrustworthiness, shall be entitled to apply to the board for reinstatement or, in the case of a revocation, for a new examination and commission after ninety days from such revocation.