Suspension is a serious action. Using the procedures of this subpart and subpart F of this part, the suspending official may impose suspension only when that official determines that—

(a) There exists an indictment for, or other adequate evidence to suspect, an offense listed under § 1508.800(a), or

(b) There exists adequate evidence to suspect any other cause for debarment listed under § 1508.800(b) through (d); and

(c) Immediate action is necessary to protect the public interest.