Contracts are to be made only with responsible Bidders unless no responsible Bidder is available to meet the Agency's needs. If there is doubt about the responsibility of a Bidder as determined by Subpart C of this Part, and if a bond or other security, such as cashiers check, certified check, or withholding a percentage of the total contract amount, would adequately protect the Agency's interests, then that Bidder may be awarded a contract upon receipt of the bond or other security.
Ill. Admin. Code tit. 71, § 2000.170