Versions of Missouri Laws 168.025 - Teacher externships, requirements -- rulemaking authority -- sunset provision on LawServer 2023 Missouri Laws 168.025 – Teacher externships, requirements — rulemaking authority — sunset provision 2022 Missouri Laws 168.025 – Teacher externships, requirements — rulemaking authority — sunset provision. 2020 Missouri Laws 168.025 – Teacher externships, requirements — rulemaking authority — sunset provision.