Theo Nash
In South Carolina, the legal blood alcohol concentration (BAC) limit is 0.08%. If a person's BAC is at or above this level, they can be charged with a DUI or DUAC (driving with an unlawful alcohol concentration). While a BAC of 0.08% or higher is enough to be convicted of DUAC, a DUI conviction requires evidence of impaired driving ability, regardless of BAC level. For drivers under 21, the legal limit is stricter at 0.02%, and commercial drivers have a limit of 0.04%. DUI checkpoints and field sobriety tests are used to identify and apprehend drivers under the influence, and refusal to comply may result in further investigation. Understanding these legal limits is crucial to navigate alcohol-related charges in South Carolina.
| Characteristics | Values |
|---|---|
| Legal alcohol limit in South Carolina | Technically, there is no legal limit for DUI in South Carolina, but you can be charged with "driving with an unlawful alcohol concentration" (DUAC) if your blood alcohol content (BAC) is 0.08% or greater. |
| DUI conviction criteria | To convict someone of DUI, the prosecution must prove that the person's faculties to drive a motor vehicle were materially and appreciably impaired beyond any reasonable doubt, regardless of their BAC level. |
| DUI penalties | DUI is a misdemeanor offense. However, it can become a felony offense if bodily injury or death is involved. A DUI conviction can result in hefty fines, a six-month license suspension, and other severe penalties. |
| Types of tests | Three types of blood alcohol tests are used in South Carolina: the Datamaster (breathalyzer), urinalysis, and blood analysis. |
| Zero-tolerance laws | South Carolina has zero-tolerance laws for underage drinking. Individuals under 21 years old cannot drive if their BAC is above 0.02%. Commercial drivers also have a lower BAC limit of 0.04%. |
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What You'll Learn
DUI laws in South Carolina
In South Carolina, it is illegal to drive while under the influence of alcohol. To determine if a driver is drunk, a police officer will typically conduct a field sobriety test and a blood-alcohol concentration (BAC) test. While there is no "legal limit" under South Carolina's DUI laws, you can be charged with Driving with an Unlawful Alcohol Concentration (DUAC) if your BAC is 0.08% or higher. This is the same limit for DUI charges, however, for a DUI, the prosecution must prove that the person's ability to drive was impaired.
The methods used to determine BAC in South Carolina are breath, blood, or urine analysis. The state uses the Datamaster DMT machine for breathalyzer tests, and these are typically conducted at the county jail before the person is booked. Refusing to submit to these tests can result in an automatic suspension of your driver's license for six months for the first offense and longer for subsequent offenses.
If you are facing your first DUI charge in South Carolina, you may encounter the following penalties:
- License suspension: 6 months
- Fines: up to $400 (plus assessments and surcharges)
- Jail time: 48 hours to 30 days (a judge may allow community service instead of jail time)
- Mandatory completion of an alcohol and drug safety action program
- Installation of an ignition interlock device (IID)
Penalties for a second or subsequent DUI offense become significantly more severe, including higher fines, longer jail time, and longer license suspension periods.
It is important to note that DUI laws in South Carolina also apply to impairment by drugs or a combination of substances, not just alcohol. Additionally, South Carolina has a zero-tolerance policy for drivers under 21, with a BAC limit of 0.02%.
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Blood Alcohol Concentration (BAC)
In South Carolina, a person's Blood Alcohol Concentration (BAC) is a key factor in determining whether they are legally allowed to drive. While there is no "legal limit" for DUI charges, a BAC of 0.08% or higher is considered sufficient evidence for a DUAC (driving with an unlawful alcohol concentration) charge. This limit is used in most states, and it is often what people assume to be the legal limit in South Carolina. However, it's important to note that this limit may not apply to everyone, as there are groups with different BAC thresholds, such as minors and commercial drivers.
The BAC limit for minors under 21 years old in South Carolina is much lower, at 0.02%. This is because, at this age, even a minor amount of alcohol can trigger impaired driving charges. Commercial drivers, such as truck drivers, also have a lower BAC limit of 0.04%. This is due to the increased risk of harm they pose to others if they cause an accident while operating a large vehicle.
The BAC limit can also vary depending on individual factors such as gender, weight, metabolism, and tolerance level. For example, men tend to have a higher BAC limit than women because they can absorb alcohol faster. Additionally, a person's weight can impact their BAC reading, with heavier individuals typically having lower BAC readings compared to lighter ones when consuming the same amount of alcohol.
In South Carolina, DUI laws prohibit driving with a BAC of 0.08% or more. If a driver's BAC is between 0.05% and 0.079%, and they exhibit signs of impairment, such as failing a field sobriety test, they may still be considered drunk and arrested. The state must prove that the person's ability to drive was materially and appreciably impaired, regardless of their BAC level, to convict them of a DUI.
The methods for testing BAC levels in South Carolina include the Datamaster breathalyzer test, urinalysis, and blood analysis. The Datamaster DMT machine is used for breathalyzer tests, and it first conducts a simulation to test itself before analyzing the breath sample. The results are then multiplied by 2,100 to determine the blood alcohol content.
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Testing methods
In South Carolina, a police officer will typically conduct a field sobriety test and a blood alcohol concentration (BAC) test to determine if a driver is drunk. If your BAC is 0.05% or lower, you are conclusively presumed to not be driving under the influence. If your BAC is higher than 0.05% but less than 0.08%, there is no inference either way. A BAC of 0.08% or higher is considered to be a rebuttable inference that the person was under the influence.
There are three types of BAC tests used in South Carolina: the Datamaster (breathalyzer), urinalysis, and blood analysis. The breathalyzer test measures "deep lung" air from the alveolar sacs in the lungs and then converts the "breath alcohol content" into "blood alcohol content" by multiplying the result by 2100. This average multiplier may not apply to every person, and there is a risk of skewed results if there is alcohol in the mouth. Therefore, there is a 20-minute observation period before the test, and the officer checks the mouth for piercings, dentures, chewing gum, or other objects that could hold alcohol.
The breathalyzer machine is also subject to radio frequency interference, and there are other circumstances that can cause inaccurate results. If your attorney can show that the machine was not reliable, the BAC result may be suppressed before the trial, and the prosecution will be unable to proceed with their case.
Urine or blood samples are usually taken at a hospital by a trained nurse. Blood tests are typically only done if the suspect was involved in a motor vehicle accident and charged with a felony DUI.
It is important to note that even a 0.01% difference in BAC can mean the difference between DUI charges being dismissed and a DUI conviction. For example, a 150-pound man who drank five 12-ounce, 6% alcohol beers over three hours would have a BAC of 0.102, which is above the legal limit in South Carolina. On the other hand, a 200-pound man who drank the same amount of alcohol over two hours would have a BAC of 0.064, which is below the limit.
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Legal consequences
In South Carolina, there is no legal blood alcohol limit for driving under the influence (DUI) charges. However, you can still be charged with DUI if your driving abilities are materially and appreciably impaired, regardless of your blood alcohol content (BAC).
For a DUI charge, the prosecution must prove that your faculties to drive a motor vehicle were impaired beyond any reasonable doubt. While a BAC of 0.08% or higher is not automatically grounds for a DUI conviction, it can be used as evidence against you.
If you are under 21 years old, South Carolina has zero-tolerance laws, and you cannot drive if your BAC is above 0.02%. Commercial drivers, who are responsible for the safety of others, have a stricter limit of 0.04%.
If you are arrested for a DUI, you can challenge the BAC testing equipment, the procedures used by law enforcement, and the reason for the traffic stop, among other things. For example, if your attorney can show that the officer did not follow SLED policy or there were irregularities with the blood alcohol test, the results may be excluded from the trial.
If you are convicted of impaired driving in South Carolina, even for a first DUI offense, you may face severe penalties, including hefty fines, a six-month license suspension, and other DUI penalties. A third DUI offense or driving under the influence with a minor in the vehicle will result in a felony charge.
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Factors influencing BAC
In South Carolina, there is no legal limit for DUI. However, a BAC of 0.08% or greater is enough evidence to convict a person of DUAC (driving with an unlawful alcohol concentration). If your BAC is over the legal limit and you've been driving, you will be arrested.
Blood Alcohol Concentration (BAC) refers to the percentage of alcohol in a person's bloodstream. The more alcohol consumed and the shorter the time period, the higher the BAC.
Gender
Men and women react to alcohol differently. Women tend to be smaller than men and get intoxicated faster. Women also have less alcohol dehydrogenase, the enzyme that metabolizes alcohol, so alcohol remains in the bloodstream longer.
Ethnicity
Individuals of Asian or Native American descent show reduced levels of alcohol dehydrogenase, meaning that alcohol will remain in the blood longer, and high concentrations can build up faster.
Sleep
Lack of sleep reduces tolerance, so impairment will be experienced at lower BAC levels than normal. For example, if you get five or fewer hours of sleep for four nights in a row, two drinks will start to feel like six drinks.
Food
Food in the stomach will slow the absorption of alcohol into the bloodstream and delay impairment. Larger meals, eaten closer to the time of drinking, can lower the peak blood alcohol concentration.
Marijuana
Marijuana reduces nausea, which can inhibit the body's ability to remove harmful toxins by vomiting. It increases the threshold required to elicit a vomit response.
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Frequently asked questions
There is no legal limit for DUI in South Carolina. However, you can be charged with "driving with an unlawful alcohol concentration" (DUAC) if your blood alcohol content (BAC) is 0.08% or higher.
For a DUI charge, the prosecution must prove that the person's faculties to drive a motor vehicle were materially and appreciably impaired. For a DUAC charge, no evidence of "intoxication" or impairment is necessary for a criminal conviction.
The criminal penalties for DUI and DUAC offenses are the same. Typically, these offenses are misdemeanors, but they can become felonies if bodily injury or death is involved. A DUI conviction can result in hefty fines, a license suspension, and other severe penalties.
Three types of tests are used to determine BAC in South Carolina: the Datamaster (breathalyzer), urinalysis, or blood analysis. The Datamaster DMT machine is used for breathalyzer tests, and it determines the alcohol content of the breath sample.
Yes, South Carolina has zero-tolerance laws for underage drinking and driving. Individuals under 21 years old cannot drive if their BAC is above 0.02%. Commercial drivers also have a lower BAC limit of 0.04% due to their unique responsibility for the safety of others.
