Section 210.30. Perjury; no defense

It is no defense to a prosecution for perjury that:
    1.  The  defendant  was  not  competent  to  make  the false statement
  alleged; or
    2. The  defendant  mistakenly  believed  the  false  statement  to  be
  immaterial; or
    3.  The  oath was administered or taken in an irregular manner or that
  the authority or jurisdiction of the attesting officer who  administered
  the  oath  was defective, if such defect was excusable under any statute
  or rule of law.