Mo. Rev. Stat. § 287.110: Scope of chapter as to injuries and diseases covered.

1. This chapter shall apply to all cases within its provisions except those exclusively covered by any federal law.

2. This chapter shall apply to all injuries received and occupational diseases contracted in this state, regardless of where the contract of employment was made, and also to all injuries received and occupational diseases contracted outside of this state under contract of employment made in this state, unless the contract of employment in any case shall otherwise provide, and also to all injuries received and occupational diseases contracted outside of this state where the employee's employment was principally localized in this state within thirteen calendar weeks of the injury or diagnosis of the occupational disease.