Can You Get a DUI Without Drinking Alcohol?

Written By Richard Waller

When most people hear the term "DUI," they immediately think of someone driving after drinking alcohol.

But alcohol is only one reason a person can be charged with driving under the influence in Illinois.

You can be arrested and charged with a DUI even if you have not consumed any alcohol at all.

Illinois law prohibits driving while a person is impaired by alcohol, drugs, or a combination of substances. Those substances can include illegal drugs, prescription medications, and even over-the-counter medications that affect your ability to drive safely.

What Does DUI Mean in Illinois?

A DUI, or driving under the influence, occurs when a person operates a vehicle while impaired by alcohol or another substance.

Many people assume that if their blood alcohol concentration (BAC) is below the legal limit—or if they have no alcohol in their system—they cannot be charged with DUI.

That is not true.

A person can face DUI charges based on impairment caused by:

  • Prescription medication

  • Marijuana

  • Illegal drugs

  • A combination of substances

  • Certain over-the-counter medications

The key issue is not simply what substance is present. The issue is whether that substance affected your ability to safely operate a vehicle.

Can Prescription Drugs Cause a DUI?

Yes.

Many people are surprised to learn that prescription medications can result in DUI charges.

A medication can be legally prescribed and still impair your ability to drive.

Examples of medications that may affect driving include:

  • Sleep medications

  • Anti-anxiety medications

  • Certain pain medications

  • Muscle relaxers

  • Some antidepressants

  • Other medications that cause drowsiness or slowed reaction time

Having a prescription does not automatically prevent a DUI charge.

The question is whether the medication impaired your ability to drive safely.

Can You Get a DUI for Marijuana in Illinois?

Yes.

Although Illinois legalized recreational cannabis for adults, driving while impaired by cannabis remains illegal.

Cannabis can affect:

  • Reaction time

  • Coordination

  • Judgment

  • Attention

  • Ability to make quick decisions

Police officers may investigate suspected cannabis impairment through observations during a traffic stop, field sobriety testing, chemical testing, and other evidence.

However, cannabis-related DUI cases can be complicated. Unlike alcohol, cannabis does not affect every person the same way, and the presence of cannabis in a person's system does not always tell the complete story of impairment.

The specific facts of the case matter.

What If I Took Medicine Exactly as Prescribed?

You can still face a DUI charge.

Following your doctor's instructions does not automatically mean you are legally allowed to drive if the medication affects your ability to operate a vehicle safely.

For example, a prescription bottle may show that you were taking medication legally, but prosecutors may still argue that the medication impaired your driving.

At the same time, the fact that you take a medication does not automatically prove impairment. The state must still prove its case.

How Do Police Prove a Drug-Related DUI?

Unlike alcohol cases, where a breath test may show a person's BAC, drug-related DUI cases often rely on multiple types of evidence.

Police may use:

  • Officer observations

  • Field sobriety tests

  • Statements made during the traffic stop

  • Blood, urine, or other chemical testing

  • Dash camera footage

  • Witness statements

  • Medical records or prescription information

No single piece of evidence automatically proves impairment.

A skilled defense attorney will examine whether the evidence actually supports the charge.

Can Police Force Me to Take a Drug Test?

Illinois has specific rules regarding chemical testing in DUI investigations.

Refusing testing can have serious consequences, including potential driver's license consequences. At the same time, a refusal does not automatically prove that someone was impaired.

The circumstances surrounding the stop, arrest, and testing request all matter.

Common Misconceptions About Drug-Related DUIs

"I wasn't drunk, so I can't get a DUI."

False.

A DUI charge can involve substances other than alcohol.

"I have a prescription, so I'm protected."

False.

A legal prescription does not automatically prevent a DUI charge.

"If cannabis is legal, I can drive after using it."

False.

Legal possession does not mean legal impairment while driving.

"A positive test means I'm guilty."

False.

A positive test may be evidence, but prosecutors still must prove the elements of the offense.

What Should You Do If You're Accused of Drugged Driving?

If you are pulled over and officers suspect you are impaired:

  • Stay calm.

  • Be respectful.

  • Do not argue about whether you are impaired.

  • Do not volunteer information about what substances you have taken.

  • Do not consent to searches without understanding your rights.

  • Contact a DUI defense attorney as soon as possible.

Remember: anything you say during a traffic stop can later become evidence.

Say Nothing. Call Me.

A DUI charge does not always involve alcohol. Prescription medications, marijuana, and other substances can all lead to serious allegations that may affect your driver's license, employment, insurance rates, and future.

If you've been charged with a DUI involving drugs or medications in Cook County, Lake County, DuPage County, Will County, or the surrounding areas, Waller Law Office can help evaluate your case and protect your rights.

The prosecution must prove that you were impaired—not simply that a substance was present.

Say Nothing. Call Me.

Richard Waller
Next

Say Nothing: Why Talking to the Police Usually Makes Things Worse