§ 405.05  Seizure and destruction of fireworks.
  Fireworks possessed unlawfully may be seized by any peace officer, acting
pursuant to his special duties, or police officer,  who  must  deliver  the
same  to  the  magistrate before whom the person arrested is required to be
taken.  The magistrate must, upon the examination of the defendant,  or  if
such   examination   is   delayed   or  prevented,  without  awaiting  such
examination, determine whether the fireworks  had  been  possessed  by  the
defendant in violation of the provisions of section 270.00; and if he finds
that the fireworks had been so possessed by the defendant,  he  must  cause
such  fireworks  to  be destroyed, in a way safe for the particular type of
such fireworks, or to be delivered to the district attorney of  the  county
in  which  the defendant is liable to indictment or trial, as the interests
of justice and public safety  may,  in  his  opinion,  require.   Upon  the
conviction  of  the  defendant,  the  district  attorney  must  cause to be
destroyed, in a way safe for the particular type  of  such  fireworks,  the
fireworks  in  respect  whereof  the  defendant stands convicted, and which
remain in the possession or under the control of the district attorney.
.

(For verification consult Official Text at Senate Gopher site.)