23152(f) Driving Under the Influence of Drugs

A car accident caused by a drug-impaired driver can leave you with severe injuries, medical bills, and lasting trauma. California’s CVC 23152(f) makes it illegal to operate a vehicle under the influence of drugs, whether prescription, over-the-counter, or illegal substances. If a drugged driver was responsible for your crash, you may have a strong claim for compensation based on their violation of this law.

What is California Vehicle Code 23152(f)?

California Vehicle Code (CVC) 23152(f) makes it illegal to drive under the influence of drugs (DUID). This law applies to any driver impaired by substances that affect coordination, reaction time, or cognitive function. Even if a drug is legally prescribed or available over the counter, it can still result in a DUID charge if it impairs driving ability.

The law applies to a wide range of substances, including illegal narcotics, prescription medications, and even common household drugs. California law does not differentiate between substances based on legality; the determining factor is whether the drug impairs the driver’s ability to operate a vehicle safely. Unlike alcohol-related DUIs, there is no legal threshold for impairment, meaning that even trace amounts of a drug in a driver’s system can lead to charges if law enforcement determines they were impaired.

The legal statute reads as follows:

“It is unlawful for a person who is under the influence of any drug to drive a vehicle. A person is under the influence if, as a result of consuming a drug, their physical or mental abilities are so impaired that they can no longer operate a vehicle with the caution of a sober person using ordinary care under similar circumstances.”

California law also allows law enforcement to arrest drivers based on observed impairment rather than a set chemical threshold. This means that even if a driver’s blood test shows only small amounts of a controlled substance, they can still be charged if their behavior suggests they were too impaired to drive safely. Officers use field sobriety tests, driver behavior, and expert assessments to determine whether a driver was under the influence at the time of the stop.

What is Considered a “Drug” Under CVC 23152(f)?

California defines a drug as any substance that affects the brain, nervous system, or muscles, impairing the ability to drive safely. This broad definition includes illegal drugs, prescription medications, and even common over-the-counter substances. If a substance alters coordination, perception, or reaction time, it may lead to a DUID charge.

Illegal substances like cocaine, methamphetamine, and heroin are well-known for their impairing effects. However, prescription opioids, muscle relaxants, and sedatives can also cause dangerous levels of impairment. Even marijuana, despite being legal in California, can lead to a DUID if it affects your ability to drive.

Many drivers do not realize that common medications can impair driving. Cough syrups, sleep aids, and allergy medications often contain ingredients that cause drowsiness or dizziness. Checking medication labels and consulting a doctor before driving can help you avoid unintentional impairment.

How Do Police Determine Drug Impairment in Drivers?

Officers use various methods to assess whether a driver is under the influence of drugs. Some key evaluation techniques include:

• Field sobriety tests – Officers may conduct balance, coordination, and cognitive tests to detect impairment. Drivers who fail these tests may be subjected to further testing.
• Drug recognition experts (DREs) – Specially trained officers assess signs of drug use through physical symptoms and behavior. These experts look for dilated pupils, muscle tremors, and slurred speech.
• Blood or urine tests – Chemical testing can detect the presence of drugs in a driver’s system. However, unlike alcohol, there is no legal threshold for drug impairment.
• Mouth swab drug tests – Some California jurisdictions use roadside saliva tests to check for drug impairment. These tests can detect substances like marijuana, cocaine, and amphetamines.
• Observations of erratic driving – Swerving, delayed reactions, or reckless behavior may indicate drug influence. Officers use this evidence to justify further testing or an arrest.

Unlike alcohol DUIs, drug DUIs do not have a legal “per se” limit. Even small amounts of a substance can lead to charges if an officer determines the driver was impaired.

How Does Marijuana Use Affect a DUID Charge?

California allows legal marijuana use, but it remains illegal to drive under the influence of THC. Unlike the threshold for alcohol impairment under CVC 23152(b), there is no established blood concentration limit for marijuana impairment. As a result, police rely on field sobriety tests and behavioral assessments to determine if a driver is impaired.

THC can remain in a person’s system for days or even weeks after use. This means that a positive drug test does not necessarily prove impairment at the time of driving. Because of this limitation, prosecutors often rely on officer observations and roadside impairment tests in DUID cases.

Drivers who use marijuana for medical or recreational purposes should be aware of its effects. Even if you feel capable of driving, residual impairment can still result in a DUID charge. Waiting several hours after consumption and being aware of dosage effects can help prevent legal complications.

What Are the Penalties for a CVC 23152(f) Violation?

A first-time DUID offense in California carries serious consequences. Penalties include fines, license suspension, and mandatory drug education programs. Even if no accident occurs, a conviction can affect employment and driving privileges.

Repeat offenses lead to harsher consequences. Drivers convicted of multiple DUIDs may face extended license suspensions, higher fines, and possible jail time. The severity of penalties increases with each additional offense within a ten-year period.

Some DUIDs are charged as felonies depending on the circumstances. If a driver causes a serious accident while under the influence of drugs, they could face felony charges. Felony DUID convictions resulting in victims’ injuries may lead to years of imprisonment and permanent license revocation.

How is a Drug DUI Different from an Alcohol DUI?

CVC 23152(a) covers alcohol DUIs, while CVC 23152(f) focuses on drug-related impairment. Both violations carry similar penalties, but the evidence used to prove impairment differs. Alcohol cases rely heavily on blood alcohol concentration (BAC) levels, while DUID cases depend more on behavioral observations.

DUID cases often require expert testimony and forensic analysis. Since there is no legal limit for drug impairment, officers must demonstrate that the driver’s ability to operate a vehicle was affected. Prosecutors may use medical records, toxicology reports, and witness statements to build their case.

Unlike alcohol DUIs, drug DUIs do not involve breathalyzers as a primary testing method. Instead, law enforcement relies on blood and urine tests to detect the presence of drugs. However, these tests can be contested in court if the results are inconsistent or improperly administered.

Pro Tip

If you take prescription medication regularly, carrying a doctor’s note may help explain why a substance is in your system, but it does not excuse impairment.

Can You Be Arrested for Driving Under the Influence of Prescription Medication?

Legal prescriptions do not exempt drivers from DUID charges. If medication impairs your ability to drive safely, you can still be cited for violating CVC 23152(f). This applies to sedatives, antidepressants, and pain relievers that affect reaction time and coordination.

Common medications that cause drowsiness or delayed reflexes include sleep aids, muscle relaxants, and anti-anxiety drugs. Even if taken as prescribed, these substances can lead to impaired judgment and slow response times on the road. Drivers should always follow warnings on medication labels before operating a vehicle.

Tip

Even over-the-counter medications can impair driving, so always check labels and avoid getting behind the wheel if you feel drowsy or dizzy.

What Are Common Defenses to a CVC 23152(f) Charge?

Drivers accused of violating California Vehicle Code 23152(f) may attempt to challenge the charges against them. Many of these defenses focus on disputing evidence, questioning officer observations, or citing legal technicalities. Understanding these potential defenses can help you anticipate arguments that the at-fault driver may use in their case.

Challenging the Accuracy of Field Sobriety Tests

Field sobriety tests (FSTs) are often used to determine impairment, but they are not always reliable. Poor lighting, uneven pavement, or physical disabilities can lead to failed sobriety tests, even when the driver is not impaired. If a driver’s attorney argues that external factors influenced the test results, this could be used as a defense.

Officers are required to follow standardized testing procedures. If the test was administered incorrectly or the officer failed to provide proper instructions, the results may be challenged. This can make it more difficult to prove that drug impairment played a role in the crash.

Arguing That Prescription Medication Use Was Lawful

Some drivers claim that their medication was legally prescribed and taken as directed. However, California law does not exempt drivers from liability if a prescribed drug impairs their ability to operate a vehicle safely. Even if a driver followed their doctor’s instructions, they can still be held accountable for the crash.

Certain medications, such as painkillers, muscle relaxants, and anti-anxiety drugs, can cause drowsiness or delayed reactions. If the at-fault driver tries to justify their impairment by citing prescription use, their argument may not hold up in court. The key issue is whether the medication affected their ability to drive safely at the time of the accident.

Claiming a Lack of Probable Cause for the Traffic Stop

To pull a driver over, law enforcement must have a valid reason, such as erratic driving or a traffic violation. If the officer lacked probable cause for the stop, the driver may argue that all evidence collected afterward should be inadmissible. This could make it harder to prove impairment in court.

However, if the crash itself served as the basis for the investigation, this defense may not be effective. When an accident occurs, law enforcement has the right to assess all involved drivers for potential impairment. This means a driver’s claim of an unlawful stop is unlikely to prevent liability in a civil case.

Disputing the Reliability of Chemical Testing

Unlike alcohol DUIs, drug DUIs do not have a legal impairment threshold. This means that chemical test results must be combined with other evidence, such as officer observations and driving behavior. If a driver’s attorney argues that a blood or urine test was mishandled, they may attempt to cast doubt on the results.

Errors in sample collection, chain of custody issues, or lab contamination could lead to test results being challenged. However, even if chemical evidence is excluded, other factors, such as erratic driving or field sobriety test failures, can still establish liability. If the driver appeared impaired at the time of the crash, chemical test disputes may not eliminate responsibility.

Asserting That Symptoms Were Due to Fatigue or a Medical Condition

Some drivers argue that their impairment-like symptoms were caused by fatigue, illness, or a medical episode. Drowsiness, low blood sugar, or neurological conditions can mimic the signs of drug impairment. In these cases, drivers may claim that their behavior was unrelated to drug use.

While certain medical conditions can affect coordination or reaction time, they do not excuse reckless driving. If a driver was aware of a condition that could impair their ability to drive safely, they may still be held liable. Attempting to use a medical defense does not change the fact that their actions led to an accident.

How Do DUID Charges Affect a Driver’s License in California?

A drug-related DUI can result in an immediate driver’s license suspension, even before a conviction. California law allows the Department of Motor Vehicles (DMV) to suspend a license if you are arrested for driving under the influence of drugs. This administrative suspension is separate from any criminal penalties you may face.

To fight a license suspension, you must act quickly. Drivers have only 10 days from the date of arrest to request a DMV hearing to challenge the suspension. If you miss this deadline, your license will automatically be suspended for a set period, even if your case is still pending in court.

Some drivers may qualify for a restricted license to continue driving under specific conditions. Completing a DMV-approved drug education program may allow you to regain limited driving privileges for work or medical appointments. However, multiple offenses or aggravating factors can make it harder to obtain a restricted license.

Note

Unlike alcohol-related DUIs, there is no set legal limit for drug impairment in California, and officer discretion plays a significant role in DUID arrests.

Find Out How a Car Accident Lawyer Can Help You

Driving under the influence of drugs puts everyone on the road at risk. If an impaired driver caused your accident, you should not have to fight for compensation alone. Contact a car accident attorney from Crockett Law Group today for a free consultation and take the first step toward financial recovery.