Iowa Code Title VIII. Transportation [Chs. 306-330B] § 321J.2A. Persons under the age of twenty-one

A person who is under the age of twenty-one shall not operate a motor vehicle while having an alcohol concentration, as defined under section 321J.1 , of .02 or more.  The driver's license or nonresident operating privilege of a person who is under the age of twenty-one and who operates a motor vehicle while having an alcohol concentration of .02 or more shall be revoked by the department for the period of time specified under section 321J.12 .  A revocation under this section shall not preclude a prosecution or conviction under any applicable criminal provisions of this chapter.  However, if the person is convicted of a criminal offense under section 321J.2 , the revocation imposed under this section shall be superseded by any revocation imposed as a result of the conviction.

In any proceeding regarding a revocation under this section, evidence of the results of analysis of a specimen of the defendant's blood, breath, or urine is admissible upon proof of a proper foundation.  The alcohol concentration established by the results of an analysis of a specimen of the defendant's blood, breath, or urine withdrawn within two hours after the defendant was driving or in physical control of a motor vehicle is presumed to be the alcohol concentration at the time of driving or being in physical control of the motor vehicle.