(a) Failure of a contractor, or an agent of a contractor, to pay or cause to be paid, in full or pro rata, the lawful claims of all persons, firms, associations of persons or corporations furnishing labor or material as required by § 803 of this title within 30 days after the receipt of any moneys or funds for the purposes of § 802 of this title shall be prima facie evidence of the payment, use or appropriation of such trust moneys or funds by the contractor in violation of this chapter.
(b) Prior to any payment made to any subcontractors for materials, workmanship and all other supplies furnished by such person, persons or corporations an inspection shall be made by the Department of Transportation of all supplies and work furnished by the subcontractors and their approval of the work shall be required before payment is made.