Mo. Rev. Stat. § 331.115: Missouri license not required, when.

A chiropractic physician licensed outside of this state shall not be required to obtain a Missouri license when:

(1) In consultation as a result of transmission of individual patient data by electronic or other means from within this state to an out-of-state licensed chiropractor with a chiropractor licensed to practice in this state, so long as a chiropractor licensed in this state retains ultimate authority and responsibility for the diagnosis or treatment in the care of the patient located within this state; or

(2) Evaluating a patient or rendering an oral or written chiropractic opinion, in connection with providing testimony or reviewing records for the purpose of any civil, criminal, or administrative proceeding in this state.