California Code, Labor Code - LAB § 7994

Any person holding an “explosive blaster's license” who is convicted of violating safety orders involving use or handling of explosives in which the violation is judged to be responsible for an accident involving serious injury or death shall have his or her license revoked for at least one year, in addition to any other penalties he or she may be assessed.  Any person who has had his or her “explosive blaster's license” revoked may apply for a new license after the minimum period of revocation expires.  He or she shall be required to pass all examinations before a new license is granted.