We will not accept cash bonds. We will only accept:

(a) Corporate surety bonds, provided that the surety company is approved by the Department of Treasury (see Department of the Treasury Circular No. 570, which is published in the Federal Register every year on or about July 1); and

(b) Personal bonds, which are secured by a cashier's check, certified check, certificate of deposit, negotiable securities such as Treasury notes, or an irrevocable letter of credit (see §§3214.21 and 3214.22).