Iowa Code § 321A.11: Matters not to be evidence in civil suits.

Neither the report required by section 321A.4, the action taken by the department pursuant to sections 321A.4 through 321A.10 and this section, the findings, if any, of the department upon which action is based, nor the security filed as provided in said sections shall be referred to in any way, or be any evidence of the negligence or due care of either party, at the trial of any action at law to recover damages.