Missouri Revised Statutes Title XXI. Public Safety and Morals § 319.321. Inapplicability of law, when

(1) Universities, colleges, or trade schools when confined to the purpose of instruction or research;

(2) The use of explosive materials in the forms prescribed by the official U.S. Pharmacopoeia or the National Formulary and used in medicines and medicinal agents;

(3) The training or emergency operations of any federal, state, or local government including all departments, agencies, and divisions thereof, provided they are acting in their official capacity and in the proper performance of their duties or functions;

(4) The use of explosives by the military or any agency of the United States;

(5) The use of pyrotechnics, commonly known as fireworks, including signaling devices such as flares, fuses, and torpedoes;

(6) The use of small arms ammunition and components thereof which are subject to the Gun Control Act of 1968, 18 U.S.C. Section 44, and regulations promulgated thereunder. Any small arms ammunition and components thereof exempted by the Gun Control Act of 1968 and regulations promulgated thereunder are also exempted from the provisions of sections 319.300 to 319.345;

(7) Any person performing duties using explosives within an industrial furnace;

(8) The use of agricultural fertilizers when used for agricultural or horticultural purposes;

(9) The use of explosives for lawful demolition of structures;

(10) The use of explosives by employees, agents, or contractors of rural electric cooperatives organized or operating under chapter 394;

(11) Individuals discharging historic firearms and cannon or reproductions of historic firearms and cannon; and

(12) Any person using explosive materials along with a well screen cleaning device for the purpose of unblocking clogged screens of agricultural irrigation wells located within the southeast Missouri regional water district as created in section 256.643.