(cattle owner filed action against investigative officer, alleging due process violations and malicious prosecution after the officer arrested owner for theft of livestock; owner’s cattle were impounded because they were roaming on the road; owner took subject cattle from impound yard without paying impound fee; officer arrested owner, asserting that sister’s owner had stated that cattle did not belong to owner; in affirming district court’s granting of summary judgment to officer, court of appeals ruled that a reasonable officer could have concluded that the owner took the cattle without legal authority; owner had taken the cattle without permission, without establishing ownership, and without paying the impound fee; the officer was entitled to official immunity as to the malicious prosecution claim because he could have concluded that probable cause existed).