Mo. Rev. Stat. § 542.261
As used in sections 542.261 to 542.296 and section 542.301, the term "peace officer" means a police officer, member of the highway patrol or water patrol to the extent otherwise permitted by law to conduct searches, sheriff or deputy sheriff.
(L. 1974 S.B. 366 § 1, A.L. 2004 S.B. 920)