901.4A  Substance abuse evaluation.
  Upon a plea of guilty, a verdict of guilty, or a special verdict upon which a judgment of conviction may be rendered, the court may order the defendant to submit to and complete a substance abuse evaluation, if the court determines that there is reason to believe that the defendant regularly abuses alcohol or other controlled substances and may be in need of treatment. An order made pursuant to this section may be made in addition to any other sentence or order of the court.
90 Acts, ch 1251, §64