SC DMV Alcohol, Drugs, and Driving 2 — Questions and Answers
Question 1: What is the BAC limit for commercial vehicle drivers in South Carolina?
- 0.04% (Correct answer)
- 0.08%
- 0.02%
- 0.06%
Correct answer: 0.04%
Commercial drivers are held to a stricter 0.04% BAC limit because of the greater danger posed by large vehicles.
Question 2: Prescription medications that cause drowsiness:
- Can impair driving just as much as alcohol (Correct answer)
- Are legal to use while driving in SC
- Only affect elderly drivers
- Have no effect when taken as directed
Correct answer: Can impair driving just as much as alcohol
Drowsiness-causing medications significantly impair reaction time and judgment, making driving dangerous regardless of a valid prescription.
Question 3: What is the minimum jail time for a first DUI conviction in South Carolina?
- 48 hours (Correct answer)
- 24 hours
- 1 week
- No mandatory minimum
Correct answer: 48 hours
A first DUI conviction in SC carries a mandatory minimum of 48 hours in jail or 48 hours of public service along with fines and license suspension.
Question 4: Under SC's DUI law, a 'habitual offender' designation can result after how many DUI convictions?
- 3 convictions within 5 years (Correct answer)
- 2 convictions
- 4 convictions in a lifetime
- 5 convictions in 10 years
Correct answer: 3 convictions within 5 years
Three DUI convictions within a 5-year period in SC can lead to a habitual offender designation, resulting in lengthy license revocation.
Question 5: What is an ignition interlock device (IID) and when may it be required in South Carolina?
- A breath test device installed in a car, required after certain DUI convictions (Correct answer)
- A GPS tracker placed by courts
- An alcohol sensor in hotels for DUI offenders
- A steering lock that prevents erratic driving
Correct answer: A breath test device installed in a car, required after certain DUI convictions
An IID requires the driver to provide a clean breath sample before the vehicle will start, and is required for DUI offenders as a condition of restricted license.
Question 6: In South Carolina, driving under the influence of marijuana is:
- Illegal, even if marijuana was legally obtained (Correct answer)
- Legal if under a medical marijuana card
- Only illegal above a set THC blood level
- Not considered DUI under SC law
Correct answer: Illegal, even if marijuana was legally obtained
SC DUI law covers any impairing substance, including marijuana; impaired driving is illegal regardless of how or where the substance was obtained.
SC DMV Alcohol, Drugs, and Driving 2
What is the BAC limit for commercial vehicle drivers in South Carolina?