Persons under the age of twenty-one.

1. 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the person is convicted of a criminal offense under section 321J.2 , the revocation imposed under this section shall be superseded by any revocation imposed as a result of the conviction. 2. 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concentration established by the results of an analysis of a specimen of the defendant’s blood, breath, or urine withdrawn within two hours after the defendant was driving or in physical control of a motor vehicle is presumed to be the alcohol concentration at the time of driving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. 95 Acts, ch 48, §7 ; 98 Acts, ch 1073, §9 ; 2018 Acts, ch 1041, §127 Referred to in §321.12 , 321.241 , 321A.17 , 321J.2B , 321J.5 , 321J.6 , 321J.8 , 321J.9 , 321J.10A , 321J.12 , 321J.13 , 321J.15 , 321J.16 , 321J.20 , 321J.25 , 321N.3