US Federal Motor Carrier Safety Regulations (49 CFR Parts 350 to 399) 383.21-37: CDL standards: one license, notification of convictions and suspensions within 30 days, employer notification of prior violations, employer must not use a disqualified driver, and no texting or hand-held phone use (383.21 to 383.37, 383.73)

What does 383.21-37 require?

No person who operates a CMV may hold more than one driver's license (383.21). A driver must notify the State of licensure within 30 days of any conviction for a traffic violation other than parking in any vehicle, and must notify the employer within 30 days of any such conviction and before the end of the next business day of any suspension, revocation, cancellation, disqualification or loss of driving privileges (383.31, 383.33). An applicant must give each prospective employer the 10-year employment history (383.35). No employer may knowingly allow a driver to operate a CMV during any period in which the driver lacks a valid CDL, is disqualified, has more than one license, or is subject to an out-of-service order (383.37), and must comply with the commercial learner's permit rules. Texting and hand-held mobile phone use while driving are disqualifying offences under 383.51 Table 4.