Mo. Rev. Stat. § 40.108: Charges — contents — oath — accused to be informed.

1. Charges and specifications shall constitute an information and shall be signed by a person subject to sections 40.005 to 40.490 under oath before a person authorized by sections 40.005 to 40.490 to administer oaths and shall state:

(1) That the signer has personal knowledge of, or has investigated, the matters set forth therein; and

(2) That they are true in fact to the best of his knowledge and belief.

2. Upon the preferring of charges, the proper authority shall take immediate steps to determine what disposition should be made thereof in the interest of justice and discipline, and the person accused shall be informed of the charges against him as soon as practicable.