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What Does “Driving Under the Influence of Drugs” Mean?

Home  >  What Does “Driving Under the Influence of Drugs” Mean?  >  What Does “Driving Under the Influence of Drugs” Mean?

May 28, 2025 | By Cummings And Kennedy
What Does “Driving Under the Influence of Drugs” Mean?

Many people only think of alcohol when they hear “driving under the influence,” but under the law, any substance that interferes with your ability to drive safely is taken very seriously.

You can face an arrest and criminal charges when authorities accuse you of driving under the influence (DUI) of a controlled substance, which can include illegal drugs or even prescription drugs that cause impairment.

To understand where you stand when you’re arrested for DUI under the influence, you need representation from a Carteret County DUI attorney. They can explain the local laws and determine how to best approach your defense for the best possible outcome.

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Defining DUI

Person driving under the influence of smoking marijuana, and becoming a liability to other drivers.

At its core, driving while under the effect of drugs simply means you’re behind the wheel while a substance is dulling your reflexes, affecting your judgment, or possibly throwing off your balance. You might not think twice about prescription meds or cough syrup from the pharmacy, but these, too, can tip the scales. The point is, it’s not just illegal drugs at issue—anything that impairs your reaction time or coordination can qualify as driving under the influence of drugs.

Factors that Lead to DUI Under the Influence of Drugs

When it comes to determining a DUI charge, law enforcement considers certain factors. First, you need to be in charge of a vehicle. That doesn’t always mean you’re zipping down the freeway—sometimes, just being in control of a car is enough to count.

Next, there’s the notion of impairment, which means your driving skills are noticeably off course—you might be weaving somewhat, talking with a slurred tone, or simply moving disjointedly. Of course, the substance behind this behavior must be a drug, whether it’s something illegal, a prescription you took, or an over-the-counter remedy.

Impairment Factors

Determining whether drugs impair someone, however, isn’t as cut and dry as measuring alcohol levels. Unlike a clear blood alcohol concentration (BAC) reading, drug impairment usually involves a mix of clues. As mentioned, officers might take note of your behavior—say, erratic swerving or unsteady speech.

In turn, the police may ask you to perform tests like standing on one leg or walking in a specific pattern, which can reveal coordination issues. Then there are the Drug Recognition Experts (DREs) who, after running a series of checks, judge which type of drug might be affecting you.

Lab tests such as blood or urine analyses come into play, too. They offer insights on treatment for addiction-related issues as well.

However, remember, if law enforcement finds a drug in your system, it doesn’t necessarily mean you were too impaired to drive properly at that exact moment in time.

Why Drug Use Is Harder to Measure and Prove

Alcohol impairment is usually measured by checking blood alcohol concentration (BAC), whereas drug involvement is determined through a mix of observations, field tests, and toxicology reports.

Figuring out drug impairment can get complicated because there are so many substances, and each affects you differently. And while there are strict BAC thresholds for alcohol, drug cases often rest on spotting a substance along with signs of being off-balance.

Drugs that Impair Driving

As noted, a variety of drugs can lead to a DUI charge. Typically, people think first about the usual suspects—marijuana, cocaine, heroin, and methamphetamine—but prescription drugs like opioids, benzodiazepines, and stimulants can also play a significant role if they impact driving. Even everyday over-the-counter medications like antihistamines or cough syrups can leave you less alert on the roadway.

Potential Punishments

Female prisoners in the prison with the light dark.

The fallout from a DUI involving drugs may be harsh. Depending on the situation and any previous run-ins with the law, you might face jail time, pay substantial fines, or have your license suspended or revoked.

Sometimes, probation is thrown into the mix—complete with conditions like drug tests and treatment requirements. In some cases, the court may require that you install an ignition interlock device (IID) if your impairment extends to alcohol at the time of arrest.

Overall, the idea is to ensure that any substance interfering with safe driving is taken seriously, regardless of whether it’s an illegal drug, a prescribed medication, or something available on drugstore shelves. It’s a field where the law plays it safe by leaning toward caution. In most cases, they prefer to risk a false negative over an unfairly harsh false positive.

Sometimes, specific penalties might be mandated. Insurance costs tend to jump significantly, and a DUI conviction hurts your driving record—this can affect employment, housing, and other life opportunities in ways that stick. The impact isn’t just on paper; it’s something you feel later after you meet sentencing.

Common Defenses

When fighting a DUI drug charge, the lawyer may use one of several strategies. The lawyer might argue that the officer did not have probable cause to pull you over. They may also challenge the reliability of the testing procedures or the equipment used—sometimes, things just don’t work as they should. In other situations, a medical condition may mimic signs of impairment, or the lawyer may show that you weren’t impaired at the time of the arrest.

Avoiding Future Problems with DUI Under the Influence of Drugs

DUI law written on golden plate next to a wooden gavel

Avoiding DUI issues related to drugs is critical. A few tips can help: steer clear of any drug use before driving. If you’re on medications—prescription or over-the-counter—read the labels carefully; you never know which side effects might catch you off guard.

If you see that a substance might dull your reactions, planning for alternate transportation is the wiser route. Educating yourself about these laws and understanding their consequences also goes a long way.

Discuss Your Case with a DUI Defense Lawyer Now

Driving under the influence of drugs isn’t just a legal headache—it’s a risky move for your safety as well. Generally speaking, knowing how impairment is measured, the differences between alcohol and drug cases, and the potential areas where defenses may be raised helps keep you on the safe side.

Being informed and making responsible decisions, even if it means planning or rechecking those medication labels, are vital to driving safely and conscientiously. If you have been arrested for DUI while under the influence of drugs, talk to a criminal defense lawyer. Have them review the factors of your case so you can go forward confidently. Schedule a legal consultation now.

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