Except as provided in section eight of this article, no public authority may award a public improvement contract which is to be let to bid to a contractor unless the terms of the contract require the contractor and its subcontractors to implement and maintain a written drug-free workplace policy in compliance with this article and the contractor and its subcontractors provide a sworn statement in writing, under the penalties of perjury, that they maintain a valid drug-free workplace policy in compliance with this article.The public improvement contract shall provide for the following:
(1) That the contractor implements its drug-free workplace policy;