California DUI Laws Explained | Los Angeles DUI Defense Attorney Ronald D. Hedding

How Is DUI Defined Under California Law?

California DUI laws are broad, aggressive, and capable of impacting nearly every aspect of your life within hours of an arrest. Many people mistakenly believe that a DUI only applies if someone is “drunk” behind the wheel or visibly intoxicated. In reality, California DUI laws allow prosecutors to pursue charges whenever they believe a driver's physical or mental abilities were impaired to the extent that the person could no longer operate a motor vehicle with the caution of a sober driver under similar circumstances. That means a DUI arrest in Los Angeles can involve alcohol, marijuana, prescription medication, fentanyl, Xanax, Ambien, Adderall, Vicodin, opioids, or any combination of substances that allegedly impaired driving ability. California DUI laws are particularly complex because they involve two separate legal battles simultaneously: the criminal court case and the California Department of Motor Vehicles administrative process. Drivers arrested for DUI throughout Los Angeles County — including Van Nuys, Torrance, Pasadena, Burbank, Glendale, Long Beach, Lancaster, Compton, and Downtown Los Angeles — often face overwhelming fear regarding jail exposure, driver's license suspension, insurance increases, employment consequences, professional licensing concerns, immigration issues, and long-term reputational damage. Attorney Ronald D. Hedding is a former prosecutor and highly experienced Los Angeles DUI defense attorney who understands how California prosecutors and law enforcement agencies aggressively investigate and prosecute DUI allegations. He has handled thousands of criminal defense and DUI matters throughout Southern California and understands that every DUI arrest is unique. Some cases involve unlawful traffic stops. Others involve inaccurate field sobriety testing, rising blood alcohol issues, unconstitutional police conduct, prescription medication misunderstandings, or faulty breath-testing procedures. California DUI laws also contain enhanced penalties for underage drivers, commercial drivers, rideshare operators, repeat offenders, and drivers accused of refusing chemical testing. Early legal intervention can be critically important because DMV deadlines begin immediately after a DUI arrest. If you were arrested for DUI in Los Angeles or anywhere in Southern California, contact Attorney Ronald D. Hedding today for a confidential consultation regarding your legal rights, DMV hearing strategy, and DUI defense options.

California Vehicle Code 23152 DUI Offenses

California DUI laws contain multiple separate DUI-related offenses under California Vehicle Code 23152.

These include:

Vehicle Code 23152(a)

Driving under the influence of alcohol such that your mental or physical abilities are impaired and you can no longer operate a vehicle like a sober person under similar circumstances.

This charge does not require a specific blood alcohol number. Prosecutors may rely upon:

• officer observations,
• field sobriety tests,
• driving patterns,
• bodycam footage,
• admissions,
• and witness testimony.

Vehicle Code 23152(b)

Driving with a blood alcohol concentration (BAC) of .08% or greater.

This is the “per se” DUI statute. Prosecutors typically rely heavily upon:

• breath tests,
• blood tests,
• toxicology reports,
• and forensic evidence.

Vehicle Code 23152(c)

Driving while addicted to a drug.

Although less commonly charged, this statute can apply even if a driver is not actively impaired at the moment of driving.

Vehicle Code 23152(d)

Driving a commercial vehicle with a BAC of .04% or higher.

Commercial drivers face much stricter standards under California DUI laws.

Vehicle Code 23152(e)

Driving a passenger-for-hire vehicle, such as:

• Uber,
• Lyft,
• taxis,
• or limousines

with a BAC of .04% or greater.

Vehicle Code 23152(f)

Driving under the influence of drugs.

These cases may involve:

• marijuana,
• fentanyl,
• Xanax,
• Adderall,
• Ambien,
• Vicodin,
• opioids,
• or prescription medications.

Vehicle Code 23152(g)

Driving under the combined influence of alcohol and drugs.

Many California DUI arrests now involve allegations of:

• mixed alcohol and marijuana use,
• prescription medication combinations,
• or alcohol combined with narcotics or sleep medication.

What Happens After a DUI Arrest in California?

After a DUI arrest, police will usually take the driver into custody for booking and chemical testing.

Depending on the circumstances, drivers may:

• provide a breath sample,
• submit to blood testing,
• or be transported to a hospital.

Some Los Angeles police stations do not perform blood draws onsite, requiring transportation to a medical facility.

Drivers may also be asked to perform:

• field sobriety tests,
• additional questioning,
• or drug-recognition evaluations.

Once released from custody, the individual will receive:

• a court date,
• paperwork regarding the arrest,
• and a pink temporary license notice if the license was confiscated.

That pink paper is critically important.

The California DMV APS Hearing Process

One of the most important parts of California DUI laws involves the DMV Administrative Per Se (APS) hearing process.

After a DUI arrest:

• the driver generally has only 10 days
• to request a DMV hearing.

If no hearing request is made:

• the license suspension may automatically begin.

Many drivers mistakenly focus only on the criminal case while ignoring the DMV side.

That is a serious mistake.

The DMV hearing is separate from the criminal court process and may determine:

• whether driving privileges are suspended,
• whether restricted licenses are available,
• and whether the suspension can be challenged.

Attorney Ronald D. Hedding assists drivers throughout Los Angeles with:

• APS hearing requests,
• stay requests,
• DMV evidence review,
• and license preservation strategies.

Should You Refuse a Breathalyzer Test?

California implied consent laws impose severe consequences for refusing chemical testing after a lawful DUI arrest.

Drivers accused of refusal may face:

• automatic license suspension,
• enhanced penalties,
• mandatory DUI education,
• and more difficult plea negotiations.

Importantly:

• refusing roadside handheld breath tests before arrest is different from refusing official post-arrest chemical testing.

This distinction becomes extremely important.

Attorney Ronald D. Hedding carefully analyzes:

• whether the stop was lawful,
• whether the arrest was legal,
• whether implied consent warnings were properly given,
• and whether refusal allegations can be challenged.

Prescription Drug DUI Cases in California

Modern California DUI laws increasingly involve prescription medication and drug-related allegations.

Common substances include:

• Xanax
• Adderall
• Ambien
• Vicodin
• Fentanyl
• OxyContin
• Marijuana
• Sleep medication
• Anxiety medication
• Opioids

Many drivers arrested for DUI are not “criminals.”

Some are:

• professionals,
• nurses,
• doctors,
• teachers,
• realtors,
• college students,
• or individuals with valid prescriptions.

Drugged driving cases often involve:

• DRE evaluations,
• toxicology disputes,
• fatigue-related allegations,
• and subjective officer observations.

Underage DUI and College Student DUI Arrests

California underage DUI laws can be especially harsh.

Drivers under 21 may face:

• zero tolerance penalties,
• license suspension,
• school discipline,
• scholarship problems,
• and future employment concerns.

College students attending:

• UCLA,
• USC,
• Loyola Marymount,
• Cal State Northridge,
• and other Southern California schools

may suddenly face both:

• criminal consequences,
• and educational discipline.

Attorney Ronald D. Hedding represents students throughout Los Angeles County facing underage DUI allegations and DMV suspension issues.

Commercial Driver DUI Cases

Commercial drivers face stricter standards under California DUI laws.

Truck drivers, delivery drivers, rideshare operators, and CDL holders may face:

• commercial-license suspension,
• employment termination,
• federal DOT complications,
• and long-term professional consequences.

Even a first DUI arrest can threaten a commercial driving career.

DUI Penalties in California

Potential DUI penalties may include:

• jail time,
• probation,
• fines,
• DUI school,
• ignition interlock devices,
• community labor,
• license suspension,
• and insurance increases.

Penalties often increase if:

• there was an accident,
• injuries occurred,
• a child was present,
• the BAC was extremely high,
• or prior DUI convictions exist.

Defending DUI Charges in Los Angeles

Every DUI case is unique.

Potential defenses may involve:

• unlawful traffic stops,
• improper police procedures,
• rising BAC defenses,
• faulty breath machines,
• unconstitutional searches,
• inaccurate field sobriety testing,
• toxicology issues,
• medical explanations,
• and improper officer conduct.

As a former prosecutor, Attorney Ronald D. Hedding understands:

• how prosecutors build DUI cases,
• how police reports are structured,
• how forensic evidence is challenged,
• and how strategic negotiations unfold.

That insight can be extremely valuable in DUI defense litigation.

DUI Arrests Throughout Los Angeles County

Attorney Ronald D. Hedding handles DUI cases throughout:

• Van Nuys
• Pasadena
• Burbank
• Glendale
• Torrance
• Long Beach
• Lancaster
• Compton
• Airport Courthouse
• Downtown Los Angeles

Each courthouse and prosecutor's office may approach DUI cases differently.

Local experience matters.

Frequently Asked Questions About California DUI Laws

Can I be charged with DUI if I was under .08%?

Yes. California Vehicle Code 23152(a) allows prosecutors to file DUI charges if they believe your driving ability was impaired, even below .08%.

What happens if I refuse chemical testing?

You may face enhanced penalties and automatic DMV suspension under California implied consent laws.

Will I lose my driver's license after a DUI arrest?

Possibly. You generally have only 10 days to request a DMV APS hearing after a DUI arrest.

Can prescription medication cause a DUI arrest?

Yes. California DUI laws apply to prescription drugs, marijuana, opioids, and other allegedly impairing substances.

Can college students face school discipline after a DUI?

Yes. Colleges and universities may impose separate disciplinary consequences after an arrest.

Do first-time DUI offenders go to jail in California?

Not always. Outcomes depend heavily upon:

• the facts of the case,
• prior history,
• BAC level,
• and defense strategy.

Contact Los Angeles DUI Attorney Ronald D. Hedding

If you were arrested for DUI in Los Angeles or anywhere in Southern California, immediate legal representation may help protect your:

• driver's license,
• criminal record,
• professional reputation,
• employment,
• and future.

Attorney Ronald D. Hedding is a former prosecutor and experienced Los Angeles DUI defense attorney who represents drivers facing:

• alcohol DUI charges,
• prescription drug DUI allegations,
• marijuana DUI accusations,
• fentanyl DUI cases,
• DMV suspension issues,
• and underage DUI matters.

Please contact Ronald D. Hedding today for a confidential consultation regarding your DUI case and defense options.