Summary
Yes. In South Carolina, a prescription medication can support a DUI charge even when a breath test shows 0.00. South Carolina Code Section 56-5-2930 applies when alcohol, another drug, a combination of drugs or substances, or alcohol combined with drugs materially and appreciably impairs a person's ability to drive.
A lawful prescription may explain why a medication was in your system. It does not automatically answer whether the medication impaired your driving. A DUI charge is still an accusation, and the State must prove the required elements.
The Bateman Law Firm represents people facing DUI allegations in South Carolina, including cases involving prescription medication and other drugs. These cases may turn on medication timing, dosage, medical conditions, officer observations, video, urine or blood testing, and the meaning of toxicology results.
Key Point: A 0.00 breath test addresses alcohol. It does not, by itself, resolve whether a prescription medication or another drug caused impairment.
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South Carolina DUI Law Is Not Limited to Alcohol
South Carolina Code Section 56-5-2930 makes it unlawful to drive while under the influence of alcohol to the point that a person's faculties to drive are materially and appreciably impaired. The same statute applies when that level of impairment is caused by another drug, a combination of drugs or substances, or alcohol combined with drugs.
Official South Carolina statute:
https://www.scstatehouse.gov/code/t56c005.php
The statute does not create an exception simply because a medication was prescribed by a doctor. A driver taking a sleep medication, anti-anxiety medication, pain medication, muscle relaxant, seizure medication, or another prescription drug could still face a DUI investigation if an officer believes the drug impaired the driver's ability to operate a vehicle.
Taking prescription medicine and then driving does not automatically equal DUI. The central question is impairment. The State must connect the evidence to the level of impairment required by South Carolina law.
For a related overview, read:
https://duigreenville.com/can-you-be-charged-dui-prescription-drugs/
What Does a 0.00 Breath Test Mean in a Drug DUI Case?
A 0.00 breath test can be useful evidence, but it does not necessarily end a DUI investigation.
Under South Carolina Code Section 56-5-2950, a breath test measures alcohol concentration. The statute states that an alcohol concentration of 0.05 percent or less creates a conclusive presumption that the person was not under the influence of alcohol.
That addresses alcohol. It does not answer whether a prescription medication or another drug caused impairment.
If an officer has reasonable suspicion that a person is under the influence of drugs other than alcohol, or a combination of alcohol and drugs, Section 56-5-2950 allows the officer to order a urine sample for testing. South Carolina law also contains requirements governing how blood and urine samples are obtained and handled.
Official South Carolina statute:
https://www.scstatehouse.gov/code/t56c005.php
This is why a driver can blow 0.00 and still face a DUI charge. The suspected source of impairment may shift from alcohol to another substance.
For more information about chemical testing and refusal issues, read:
https://duigreenville.com/implied-consent-and-refusing-a-chemical-or-breath-test/
A Valid Prescription Is Relevant, but It Is Not the Whole Case
A lawful prescription can be important evidence. It may establish the medication, dosage, prescribing instructions, date of the prescription, and whether the medication was recently started or changed.
Those facts can explain why the substance was present. They do not automatically prove impairment, and they do not automatically disprove it.
Consider two drivers who take the same prescription medication. One has taken the same dose for years without noticeable driving-related side effects. The other began the medication that morning and experienced severe drowsiness. A laboratory result identifying the same drug does not tell the complete story for either person.
Questions that may matter include:
- When was the medication taken?
- What dosage was prescribed?
- Was the medication taken as directed?
- Was another medication, drug, or substance involved?
- Had the dosage recently changed?
- Could a medical condition explain the behavior the officer described?
- Could fatigue, lack of sleep, injury, or another non-drug factor have affected the driver's appearance or performance?
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Drug Presence Is Different From Proof of Impairment
Prescription drug cases can be less straightforward than alcohol cases because there may be no single number that resolves impairment.
A toxicology result may show that a drug or metabolite was detected. The next question is what that result proves about the person's condition while driving. The timing of the sample, the medication involved, the driver's behavior, and other evidence may all matter.
South Carolina law permits evidence bearing on a driver's faculties, including field sobriety evidence, driving evidence, bodily-fluid test results, and video. A drug result should be considered in that wider factual setting.
The fact that a substance appears in a sample and the question of whether it caused material and appreciable impairment are related. They are not identical questions.
What Evidence May Be Used in a Prescription Medication DUI Case?
A drug-related DUI case may be built from several pieces of evidence rather than one test result. Depending on the facts, that evidence can include:
- The reason for the traffic stop
- Lane position, speed, braking, or other driving behavior
- Speech, balance, coordination, alertness, and responsiveness
- Performance on field sobriety exercises
- Statements about medication use and timing
- Dash-camera or body-camera footage
- Prescription containers or pharmacy records
- Urine, blood, or other toxicology evidence
- Relevant medical information
- Witness observations
Each piece needs context. Slurred speech can have causes other than drug impairment. Balance problems may be connected to an injury or medical condition. Anxiety, fatigue, footwear, physical limitations, or the roadside surface can affect field sobriety exercises.
For more information about roadside testing issues, read:
https://duigreenville.com/challenging-the-results-of-a-field-sobriety-test-in-south-carolina/
Can a Medical Condition Be Mistaken for Drug Impairment?
Some medical conditions can affect balance, speech, coordination, movement, alertness, or appearance. Those same characteristics may be described by an officer as signs of impairment.
Suppose a driver in Greenville, South Carolina, is stopped for a lane violation. The driver has a neurological condition and takes a prescribed medication. The officer observes slow movement and unsteady balance, and a later test detects the medication. Those facts alone do not establish whether the condition, the medication, or another factor explains what the officer observed.
Medical records, prescription history, dosage information, symptoms, and video can help place those observations in context.
For more information about medical issues that can affect DUI evidence, read:
https://duigreenville.com/medical-conditions-dui-lawyer-greenville/
Refusing a Drug Test Can Create a Separate License Problem
A prescription medication DUI case can involve both a criminal charge and an administrative driver's license matter.
South Carolina's implied consent laws provide that refusing a requested chemical test or sample can trigger a license suspension. Section 56-5-2951 provides a 30-day period to request a contested case hearing after a notice of suspension is issued.
The license issue is separate from whether the State ultimately proves the DUI charge in court. A person can face an administrative deadline while the criminal case remains pending.
Because testing facts vary, a lawyer may examine:
- What test or sample was requested
- What warnings were given
- Whether statutory procedures were followed
- How the sample was collected and handled
- What paperwork was issued
- Whether the administrative deadline has been preserved
For more information about implied consent and testing, read:
https://duigreenville.com/implied-consent-and-refusing-a-chemical-or-breath-test/
What Can a DUI Defense Lawyer Examine?
There is no single defense to every prescription medication DUI case. A lawyer may review the traffic stop, the basis for arrest, roadside testing, video, chemical testing, medical information, and the claimed connection between the medication and impairment.
Specific questions may include:
- Did the officer have a lawful basis to stop the vehicle?
- Does the written report match the dash-camera or body-camera video?
- Were field sobriety exercises administered and interpreted fairly?
- Was a urine or blood sample collected and handled according to required procedures?
- What does the toxicology evidence actually establish?
- Is there evidence connecting the detected medication to material and appreciable impairment?
- Could a medical condition, fatigue, injury, or another factor explain the driver's appearance or performance?
A valid prescription does not make the charge disappear. A positive drug result also does not automatically establish guilt.
What Should You Do After a Prescription Medication DUI Arrest?
Preserve information that may later matter. Write down the medication name, dosage, when you took it, whether the dose recently changed, and what happened before the stop while the details are still fresh.
You may also want to preserve:
- The prescription bottle
- Pharmacy paperwork
- Prescribing instructions
- Relevant medical records
- Names of witnesses who saw you shortly before the stop
- Information about possible dash-camera, body-camera, business, or residential video
- License-suspension paperwork and hearing notices
Avoid posting details about the arrest on social media. Pay close attention to license-suspension paperwork because an administrative deadline can arise before the criminal case is resolved.
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Talk With The Bateman Law Firm About a Prescription Medication DUI
A 0.00 breath result does not automatically prevent a South Carolina DUI charge when police suspect prescription medication or another drug caused impairment. Lawful medication use and a positive toxicology result also do not automatically establish guilt. The driving evidence, testing, medical history, video, and alleged impairment all matter.
The Bateman Law Firm offers free consultations for people facing DUI allegations. The firm serves clients in Greenville, Clemson, Spartanburg, and nearby areas in South Carolina.
Call (864) 406-3004.
tel:+18644063004
Contact The Bateman Law Firm:
https://duigreenville.com/contact/
This article is for informational purposes only and is not legal advice. Consult an attorney about your specific situation.
