Mo. Rev. Stat. § 190.909: Conditions of practice in a remote state.

An individual may practice in a remote state under a privilege to practice only in the performance of the individual's EMS duties as assigned by an appropriate authority, as defined in the rules of the commission, and under the following circumstances:

(1) The individual originates a patient transport in a home state and transports the patient to a remote state;

(2) The individual originates in the home state and enters a remote state to pick up a patient and provides care and transport of the patient to the home state;

(3) The individual enters a remote state to provide patient care or transport within that remote state;

(4) The individual enters a remote state to pick up a patient and provides care and transport to a third member state; or

(5) Other conditions as determined by rules promulgated by the commission.