Which of the following is NOT a regulation by FMCSA addressing licensing issues?

Answer: C — Updated requirements for issuing a breathalyzer

The correct choice is the updated requirements for issuing a breathalyzer, as this is not a regulation established by the Federal Motor Carrier Safety Administration (FMCSA) concerning licensing issues for commercial drivers. FMCSA regulations typically focus on aspects that directly impact the safety and compliance of commercial drivers, including definitions of violations, the procedure for checking driving records, and the consequences of specific traffic offenses. The expanded definition of serious traffic violations sets clear parameters for what constitutes a serious infraction, which can affect a driver's licensing status. The extended driver record check ensures that drivers' histories are adequately assessed to maintain safety standards and compliance with regulations. Similarly, disqualification for violations while driving a non-commercial vehicle takes into account the overall driving behavior of commercial drivers and allows for the enforcement of safety across all vehicles they operate. Conversely, the requirements for issuing a breathalyzer pertain more to substance testing and public health measures rather than licensing regulations as defined by the FMCSA. Therefore, this answer highlights that while breathalyzer regulations may exist, they fall outside the specific purview of FMCSA licensing regulations.