The plea
of guilty in any court, the decision
of guilty by any court, the forfeiture by the teaching certificateholder
of a bond in any court
of law, or the written
acknowledgment, duly witnessed,
of offenses listed in subsection (1) to the district school superintendent or a duly appointed representative
of such superintendent or to the district school board shall be prima facie proof
of grounds for revocation
of the certificate as listed in subsection (1) in the
absence of proof by the certificateholder that the plea
of guilty, forfeiture
of bond, or admission
of guilt was caused by threats, coercion, or fraudulent means.