A commercial driver can lose work, face a disqualification, or trigger higher employer scrutiny by assuming a ticket can be reduced, deferred, or kept off the driving record the way it sometimes can for a non-commercial license. The masking prohibition for a CDL is the rule that bars courts, prosecutors, and licensing agencies from hiding, dismissing, deferring, or changing the outcome of a traffic violation if the purpose is to keep a conviction from appearing on a commercial driving record.

Under federal law, 49 C.F.R. § 384.226 requires states to prevent this kind of "masking" for CDL holders. That means a commercial driver usually cannot use a plea deal, diversion, probation before judgment, or similar arrangement to avoid the licensing consequences of an offense committed in any type of vehicle. The violation may still be negotiated in some ways, but it cannot be handled in a way that conceals the conviction from the CDL record.

For an injury claim, this can matter when a crash leads to a citation. A conviction that cannot be masked may support arguments about negligence, unsafe driving history, or employer notice of prior problems. In New Hampshire, CDL rules are administered through the Division of Motor Vehicles under state law implementing federal commercial-driver standards, so a driver cited after dangerous conditions on I-93 or elsewhere may face consequences that cannot simply be bargained away.