Per MDC website, which took a whole 30 seconds to find, a resident of missouri must prove they have a certificate from another state. Once they are in the system, they won't need to provide any proof from there on out. Says electronic or written proof can be a viable source.
https://huntfish.mdc.mo.gov/hunting...unter-education-and-certification-requirement
https://huntfish.mdc.mo.gov/hunting...unter-education-and-certification-requirement
