3 Pa. Stat. § 41h
The department shall have power to investigate upon complaint, in such form as it may require, of any financially interested person or upon its own initiative, the record of any applicant or licensee, or any transaction involving the solicitation, receipt, sale or attempted sale of farm produce, the failure to make proper and true accounts and settlements at prompt and regular intervals, the making of false statements as to market conditions with intent to deceive, rejection of any farm produce without just cause, the making of false statements as to condition, quality or quantity of goods received, or the failure to make payment for goods received, or other alleged unethical practices. For such purposes the department may examine, at the place or places of business of the applicant or licensee, his ledgers, books of accounts, memoranda, and other documents which relate to the transaction involved, and may take testimony thereon under oath.
3 P.S. § 41h