The commissioner, or his duly authorized representative, for the purpose of discovering violations of this chapter and for the purpose of determining whether persons are subject to the provisions of this chapter, may examine persons licensed under this chapter and persons reasonably suspected by the commissioner of conducting business that requires a license under this chapter, including all relevant books, records and papers employed by those persons in the transaction of their business, and may summon witnesses and examine them under oath concerning matters relating to the business of those persons, or such other matters as may be relevant to the discovery of violations of this chapter, including without limitation the conduct of business without a license as required under this chapter.