(1) no one may possess an explosive unless:

(a) they have in their immediate possession at all times during the possession of the explosive a valid certificate of possession issued to them under 480.235 (waiting period for issuance of certificate of possession)

(b) they possess a license or permit issued by the BATF of a type that authorizes the possession OR

(c) they are listed as a responsible person or employee possessor under a license or permit described in (b) above

(2) a person in possession of an explosive will display a certificate of possession or federal license or permit upon the demand of the State Fire Marshal, an assistant to the State Fire Marshal, a magistrate or a law enforcement agency, public fire department or fire protection agency of this state.

(3) it's a defense to a charge under (1) that the person so charged produce in court:

(a) a certificate described in (1)(a) that was valid at the time of their arrest

(b) proof that they have a license or permit issued by the BATF of a type authorizing them to possess the explosives OR

(c) proof that they are listed as a responsible person or employee possessor under a license or permit described in (b) above