Yes. Commercial truck drivers are required to obtain additional training to learn how to safely operate their vehicles. If they are hauling hazardous chemicals, they are also required to undergo additional training and certification. In many states, drivers can be cited for alcohol impairment with a lower blood alcohol content than other drivers. In South Carolina, the legal impairment limit for those operating a commercial truck with a CDL is 0.04%. Commercial vehicle and semi-truck drivers found to be above that limit risk being arrested and having their CDL suspended.