30 C.F.R. § 850.15
(b) Suspension and revocation.
(1) The regulatory authority, when practicable, following written notice and opportunity for a hearing, may, and upon a finding of willful conduct, shall suspend or revoke the certification of a blaster during the term of the certification or take other necessary action for any of the following reasons:
(e) Conditions. The regulatory authority shall specify conditions for maintaining certification which shall include the following: