As a commercial driver in South Carolina, you may be subject to stricter driving under the influence (DUI) laws that increase your chances of facing jail time. These regulations apply because of the size of the vehicles you operate and the responsibilities involved in your job. Understanding how these rules generally work and exploring possible defenses may help you better protect your commercial driver’s license (CDL) and potentially reduce the risk of harsher penalties.
What BAC limits apply to you as a commercial driver?
South Carolina law sets the legal BAC limit at 0.08% for most drivers. As a commercial driver, your limit drops to 0.04% whenever you operate a commercial vehicle. That lower threshold means a small amount of alcohol may push you over the limit. A DUI in your personal vehicle can affect your CDL, so your job may face consequences even when you are off duty.
With this in mind, CDL penalties may include a one-year disqualification for a first DUI, a three-year disqualification if hazardous materials were involved and a lifetime disqualification after a second DUI.
What other actions could put your CDL at risk?
Your CDL may also be at risk in several situations that do not involve alcohol. These include:
- Driving under the influence of illegal drugs
- Driving under the influence of certain prescription medications
- Refusing chemical testing
- Leaving the scene of a crash
- Using a vehicle during the commission of a felony
Each situation may lead to CDL consequences similar to those for an alcohol-related DUI.
How do administrative and criminal penalties affect you?
You face two different penalty tracks as a CDL holder and understanding both may help you respond quickly. On the administrative side, the South Carolina DMV may suspend your license soon after a DUI arrest or a chemical test refusal. These actions may take effect before a court reviews your case. On the criminal side, the courts may impose jail time, fines and substance-related programs. This combination may place your CDL at risk early, so prompt action can be important.
South Carolina also raises penalties with each DUI conviction:
- First offense: Up to $400 fine ($992 total), 48 hours to 30 days in jail, six-month license suspension
- Second offense: $2,100–$5,100 fine ($10,744.50 total), five days to one year in jail, one-year license suspension
- Third offense: $3,800–$6,300 fine ($13,234.50 total), 60 days to three years in jail, two-year suspension; longer if within five years, vehicle confiscation if within 10 years
- Fourth or subsequent offense: One to five years in prison, permanent license revocation
Protect your CDL and future
Fighting a DUI charge as a CDL holder can be challenging. Understanding the South Carolina DUI rules, knowing potential penalties and exploring defenses like questioning a traffic stop, challenging test results or reviewing evidence can help you prevent jail time and protect your commercial driving career.
