Mo. Rev. Stat. § 104.272
Other provisions of law to the contrary notwithstanding, any person who is an employee of state government and a member of the transportation department employees' and highway patrol retirement system is entitled to credit for all of his service during employment with the department of transportation or the state highway patrol if he is an employee of that same agency upon retirement regardless of whether he was classified as full-time, part-time or temporary, and the requirement of section 104.010 of duties during not less than one thousand hours for status as an employee shall not apply to persons applying for retirement credit under the provisions of this section.
(L. 1992 S.B. 499, et al. § 1)