(a) Upon the complaint of any interested person or upon his own initiative, the Commissioner shall have the power to investigate:

(1) The record of any applicant or licensee;

(2) Any transaction involving the solicitation, receipt, sale, or attempted sale of grain;

(3) The failure to pay proper and true accounts and settlements at prompt and regular intervals;

(4) The making of false statements as to condition, quality, or quantity of grain received or in storage;

(5) The making of false statements as to market conditions with intent to deceive;

(6) The failure to make payment for grain received; or

(7) Other alleged injurious transactions.

(b) For such purposes, the Commissioner or his agents may examine the ledgers, books of accounts, memoranda, and other documents which relate to the transaction involved, at the place or places of business of the applicant, licensee, or unlicensed person, partnership, corporation, or other entity, and may take testimony thereon under oath.