Which of the following is a disqualifying offense for obtaining a CDL?

Driving under the influence of alcohol or drugs is considered a disqualifying offense for obtaining a Commercial Driver License (CDL) because it poses a significant safety risk to both the driver and the public. Commercial drivers are held to a higher standard due to the nature of their work, which often involves operating large vehicles that can cause severe damage or injury when operated improperly. A DUI conviction reflects a disregard for the law and the safety rules governing the operation of commercial vehicles. This enforcement helps to ensure that only those who can safely operate these vehicles are permitted to do so, reinforcing the importance of responsible driving within the commercial sector.

In contrast, while speeding tickets, running a stop sign, and failing to signal can lead to penalties and points on a driver's record, they do not automatically disqualify an individual from obtaining a CDL unless they are part of a pattern of unsafe driving behaviors or lead to more severe violations. The seriousness of a DUI conviction elevates it to a level of offense that typically results in disqualification, reflecting the critical importance placed on safety in commercial driving.