Mo. Rev. Stat. § 260.550: Information to be available to public, exceptions.

Information obtained under the provisions of sections 260.500 to 260.550 or any rule or regulation, order or condition adopted or issued thereunder, or any investigation authorized thereby, shall be available to the public unless:

(1) Nondisclosure is requested in writing;

(2) Such information constitutes trade secrets or information which is entitled to confidential treatment in order to protect any plan, process, tool, mechanism, or compound which is known only to the person claiming confidential treatment and confidential treatment is necessary to protect such person's trade, business or manufacturing process;

(3) Such nondisclosure will not result in an unreasonable threat to the health of humans or the environment; and

(4) Disclosure is not required under any federal act. Any employee of a department or any former employee of a department who, for a period of two years after the termination of such relationship, is convicted of willful disclosure or conspiracy to disclose trade secrets or information which is entitled to such confidential treatment to any person other than one entitled to the information under sections 260.500 to 260.550 is guilty of a class A misdemeanor.