Any person, whether licensed by Virginia or not, who operates a commercial motor vehicle upon a highway as defined in § 46.2-100 in the Commonwealth shall be deemed thereby, as a condition of such operation, to have consented to have samples of his blood, breath, or both blood and breath taken for a chemical test to determine the alcohol, drug or both alcohol and drug content of his blood, if he is arrested for violation of § 46.2-341.24 or § 46.2-341.31 within two hours of the alleged offense.

If the certificate of analysis referred to in § 46.2-341.26:9 indicates the presence of alcohol in the suspect's blood, the suspect shall be taken before a magistrate to determine whether the magistrate should issue an out-of-service order prohibiting the suspect from driving any commercial motor vehicle for a twenty-four-hour period. If the magistrate finds that there is probable cause to believe that the suspect was driving a commercial motor vehicle with any measurable amount of alcohol in his blood, the magistrate shall issue an out-of-service order prohibiting the suspect from driving any commercial motor vehicle for a period of twenty-four hours. The magistrate shall forward a copy of the out-of-service order to the Department within seven days after issuing the order. The order shall be in addition to any other action or sanction permitted or required by law to be taken against or imposed upon the suspect.