(a) A person commits the crime of perjury if the person makes a false sworn statement which the person does not believe to be true.
(b) In a prosecution under this section, it is not a defense that
(1) the statement was inadmissible under the rules of evidence; or
(2) the oath or affirmation was taken or administered in an irregular manner.
(c) Perjury is a class B felony.