(b) Nothing in this article shall be construed as applying to:
(1) Toy paper caps containing not more than 0.25 of a grain of explosive composition per cap;
(2) The manufacture, storage, sale or authorized use of signals necessary for the safe operation of railroads or other classes of public or private transportation;
(3) The military or naval forces of the United States or of this state while in the performance of official duty;
(4) Law enforcement officers while in the performance of official duty; or
(5) The sale or use of blank cartridges for ceremonial, theatrical or athletic events.