The department shall adopt rules for downgrading a commercial driver’s license to a noncommercial status upon a driver’s failure to provide a medical examiner’s certificate as required pursuant to section 321.188, subsection 1, paragraph “c”, or upon a driver’s failure to provide a self-certification of type of driving as required pursuant to section 321.188, subsection 1, paragraph “c”. The rules shall substantially comply with 49 C.F.R. § 383.71 and 383.73, as adopted by rule by the department.
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