(a) Notwithstanding any other provision of this article, a person may not drive, operate, or be in physical control of a commercial motor vehicle while having any measurable alcohol in his or her system.

(b) A person who drives, operates, or is in physical control of a commercial motor vehicle while having any measurable alcohol in his or her system or who refuses to take a test under paragraph (1) of subsection (a) of Code Section 40-6-392 to determine his or her alcohol content must be placed out of service for 24 hours.