49 C.F.R. § 383.21 Number of drivers' licenses.
Title 49 - Transportation
No person who operates a commercial motor vehicle shall at any time have more than one driver's license. [64 FR 48110, Sept. 2, 1999]
Title 49: Transportation
PART 383—COMMERCIAL DRIVER'S LICENSE STANDARDS; REQUIREMENTS AND PENALTIES
Subpart B—Single License Requirement
§ 383.21 Number of drivers' licenses.