§ 210.50 Perjury and related offenses; requirement of corroboration. In  any  prosecution  for  perjury,  except  a  prosecution based upon  inconsistent  statements  pursuant  to  section  210.20, or in any  prosecution  for making an apparently sworn false statement, or making a  punishable false written statement, falsity of a statement  may  not  be  established by the uncorroborated testimony of a single witness.