You’re driving home when flashing red-and-blue lights appear in your rearview mirror. The officer says they’re checking for a DUI. You only know the term DWI, and now you feel confused. Many out-of-state drivers in San Diego wonder what the difference is and if one carries worse penalties than the other.
In California, people often search for both terms after a traffic stop. But state law only uses one charge. Police reports, court papers, and DMV notices all read ”DUI”. This guide explains what that means, what the penalties could be, and what you should do next to protect your license in San Diego County.
What Is a DUI?
DUI stands for Driving Under the Influence. It is the main criminal charge California uses when someone drives while affected by alcohol, cannabis, prescription medicine, or over-the-counter drugs.
California sets these Blood Alcohol Concentration (BAC) limits. BAC means the amount of alcohol in your blood, shown as a percentage:
- Drivers over 21: 0.08% BAC
- Commercial drivers: 0.04% BAC
- Drivers under 21: 0.01% BAC (zero-tolerance rule)
A BAC under 0.08% does not always mean you’re safe to drive. Under California Vehicle Code § 23152, police can still arrest you if they believe alcohol or drugs affected your driving ability, even if your BAC is below the legal limit.
To support their case, after stopping you for suspicious behavior, officers look for physical signs and do basic roadside tests to check whether you’re sober or not:
- Horizontal Gaze Nystagmus (HGN) tests. The officer moves a pen or small flashlight side to side in front of your eyes. They check your eye movement for subtle, uncontrolled twitching that can happen when alcohol or drugs slow eye-muscle control.
- Physical balance checks (walk-and-turn and one-leg stand). The officer can ask you to walk in a straight line heel-to-toe or stand on one foot to test your focus and balance.
- Breath tests at the scene. You’ll be asked to blow into a small handheld device. Officers use this initial breath test to check your blood alcohol level before deciding if they’ll make an arrest.
DUI and Other Drugs
California also treats driving under the influence of cannabis, prescription medication, over-the-counter medicine, or illegal drugs as DUI. There is no separate “DWI” label for drug-related driving. Unlike alcohol, California does not apply a single legal drug limit. Prosecutors may rely on overall evidence, such as driving behavior, officer observations, field sobriety tests, and blood or urine test results. Drug-only DUI cases can also lead to DMV penalties.
First-time DUI arrests without injuries are usually misdemeanor crimes. But charges turn into serious felonies if someone is hurt in an accident, or if you have three prior DUI convictions on your record within ten years.
What Is a DWI?
DWI stands for Driving While Intoxicated. People use this term in everyday talk and in other states, but California courts do not.
Visitors, students, and military members in San Diego often bring the word “DWI” from other states. Local police and the California Highway Patrol still write every ticket as a DUI.
DUI vs DWI in San Diego: What Is the Difference?
California uses only one official charge: DUI. DWI is not a separate offense under state law.
San Diego judges, prosecutors, and defense lawyers all use the term DUI. The confusion mostly comes from search engines and national news. Some states, like New York, Texas, Missouri, and New Jersey, use both terms and treat DWI as a more serious charge. When people in San Diego search online, those out-of-state articles show up in the results. That’s why so many drivers end up searching for “DUI vs DWI” even though California only uses the DUI charge.
In this state, any impaired driving is treated the same: driving while alcohol or drugs have affected your ability to drive safely.
What Are the Legal Consequences of a DUI in San Diego?
A DUI charge in San Diego can bring penalties from the court and the Department of Motor Vehicles (DMV). Penalties get heavier with repeat offenses, a high BAC (0.15% or more), or a child in the car.
| Penalty category | Typical first-offense range |
| Fines and court costs | $1,400 to $2,600 or more |
| DMV license suspension | 4 to 6 months; an IID option may be available |
| Mandatory DUI school | Three-month, 30-hour program |
| Probation | Three to five years of informal probation |
Fines and Probation
The basic fine for a first offense is about $390. After court fees, the total cost often goes over $2,000.
DMV License Suspension
The DMV acts separately from the criminal court. After the arrest, the officer confiscates your physical license and gives you a pink temporary paper permit that lasts 30 days. You must ask the DMV for a hearing within 10 days, or your license will be suspended.
DUI School
Courts require every convicted driver to finish a state-licensed DUI program. First-time offenders with a BAC under 0.15% usually complete a 3-month (30-hour) program. Higher BAC levels or prior offenses require longer programs.
Jail Time and Community Service
A first-time misdemeanor DUI can carry up to 6 months in county jail. Most first offenses do not end in actual jail time. Judges more often order community service, public work service, or home electronic monitoring (an ankle bracelet that tracks your location).
Ignition Interlock Device (IID)
Many drivers can keep driving by installing an Ignition Interlock Device. This small breath tester is wired to your car’s ignition. The car will not start until you blow a clean sample. If the device detects alcohol, the car stays locked, and the device records the failed test. While you drive, it can ask for random retests. It also has a camera that photographs the person blowing to confirm it is you. The device stores every test result and reports them to the DMV during required service visits every 30 to 60 days.
Misdemeanor vs. Felony
Most first, second, and third DUI arrests with no injuries are misdemeanors. The charge becomes a felony if the accident causes injury or death, or if you already have a felony DUI on your record in the last 10 years.
Child Endangerment
If a child under 14 is in the car when you’re arrested, the penalties become much worse. You face extra mandatory jail time, and prosecutors can also file a separate child endangerment charge.
Expungement
A DUI conviction stays on your criminal record and can show up in background checks. After you finish probation, pay your fines, and complete DUI school, you can ask the court to set aside the conviction under Penal Code section 1203.4. This removes it from most public background checks, but it does not erase it from your DMV record or from the 10-year lookback period for future DUI charges.
What to Do If You Are Charged With a DUI in San Diego
If you’re arrested for DUI in San Diego, officers may take you into custody while they finish the process before releasing you. After the arrest, the DMV can suspend your license on its own, separate from the criminal court case. You have only 10 days from the date of arrest to request a DMV hearing if you want to fight the suspension. If you miss that deadline, the suspension usually starts automatically.
The DMV case and the criminal court case are two different matters. The DMV decides whether you can keep driving. The court decides the criminal charge. A DUI lawyer can review the evidence, protect your rights, appear at the DMV hearing, speak with the prosecutor, and help build a defense based on the facts of your case.
Contact a qualified DUI attorney as soon as possible after an arrest so you understand your options and don’t miss important deadlines.
Get Legal Help for DUI Cases in San Diego
HHJ Trial Attorneys provides legal support after a DUI arrest in San Diego. We review your case, investigate the arrest, and carefully examine the evidence.
We look for problems with the traffic stop, field tests, breath test, or blood test. We handle contact with the prosecutor and the DMV, and we work to protect your rights at every step. We also help build a defense based on the specific facts of your case.
Do not wait. Contact HHJ Trial Attorneys as soon as possible to talk about your case and next steps.
