Sec. 65.20  Sentence of unconditional discharge.
    1.    Criteria.    The   court   may  impose  a  sentence  of
unconditional discharge in any case where  it  is  authorized  to
impose a sentence of conditional discharge under section 65.05 if
the court is of the opinion  that  no  proper  purpose  would  be
served by imposing any condition upon the defendant's release.
    When  a  sentence of unconditional discharge is imposed for a
felony, the court shall set forth in the record the  reasons  for
its action.
    2.    Sentence.    When  the  court  imposes  a  sentence  of
unconditional discharge, the defendant  shall  be  released  with
respect  to  the  conviction  for  which  the sentence is imposed
without imprisonment, fine or probation supervision.  A  sentence
of  unconditional  discharge is for all purposes a final judgment
of conviction.
.

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