Sec. 135.75  Coercion; defense.
    In  any  prosecution  for coercion committed by instilling in
the victim a fear that he or another person would be charged with
a  crime,  it  is  an  affirmative  defense  that  the  defendant
reasonably believed the threatened charge to be true and that his
sole  purpose  was  to  compel  or  induce  the  victim  to  take
reasonable action to make good the wrong which was the subject of
such threatened charge.
.

(For verification consult Official Text at Senate Gopher site.)