(a) The commissioner may, upon his or her own motion, or upon the sworn complaint of any person, conduct an investigation to determine if any provision of this article or of any rule promulgated by the board or commissioner under authority of this article has been violated by any retail licensee. The commissioner may suspend or revoke a retail license if the retail licensee or any employee thereof acting in the scope of his or her employment has violated any such provision, and may suspend a retail license without hearing for a period not to exceed twenty days if he or she finds probable cause to believe that the retail licensee or any employee thereof acting in the scope of his or her employment has willfully violated any such provision.

(b) The commissioner may revoke a retail license for any reason which would constitute grounds for the denial of an application filed pursuant to section eight of this article.