Mo. Rev. Stat. § 444.670

Commission members and authorized representatives of the commission may at all reasonable times enter upon any lands being strip mined for the purpose of inspection to determine whether the provisions of sections 444.500 to 444.755 have been complied with. No person shall refuse entry or access requested for purpose of inspection, to any member of the commission or authorized representative who presents appropriate credentials, nor obstruct or hamper any such person in carrying out the inspection. A suitably restricted search warrant, describing the place to be searched and showing probable cause in writing and upon written oath or affirmation by any member of the commission or authorized representative, shall be issued by any circuit judge or associate circuit judge in the county where the search is to be made.