Final answer:
Driving under the influence (DUI) while operating a commercial motor vehicle (CMV) can cause a driver to lose their CDL for one year.
Step-by-step explanation:
One offense that can cause a driver to lose a Commercial Driver's License (CDL) for one year is driving under the influence (DUI) while operating a commercial motor vehicle (CMV). If a driver is convicted of a DUI in a CMV, their CDL will be suspended for one year. This is a serious offense as it endangers the safety of both the driver and others on the road. It is important for commercial drivers to understand the consequences and to prioritize safe driving behaviors.