Mo. Rev. Stat. § 327.371: Surveyor exempt from trespass but liable for damages.

A professional land surveyor licensed pursuant to the provisions of this chapter, together with such professional land surveyor's survey party, who in the course of a land survey finds it necessary to go upon the land of a party or parties other than the one for whom such professional land surveyor is making the survey shall not be guilty of trespass but shall be liable for any damage done to such lands or property.