Alcohol isn’t the only substance that impairs driving. California DUI law covers “alcohol and/or drugs”, meaning:
You can be arrested and convicted for DUI based on drugs alone, or a mix of drugs and alcohol, even if your BAC is below 0.08%.
🚫 Illegal Drugs
Driving under the influence of illicit drugs is dangerous and illegal:
- Stimulants (cocaine, meth): cause risky behavior, hallucinations, and poor impulse control.
- Depressants (heroin, other narcotics): reduce alertness, coordination, and can cause you to nod off.
🌿 Cannabis (Marijuana)
- Legal for 21+ in California, but illegal to drive under its influence.
- THC affects reaction time, focus, perception, and tracking.
- Confidence may rise, but skills decrease – similar to alcohol.
No fixed THC limit like BAC:
- Arrests are based on behavior, observations, and sometimes blood tests.
- Edibles pose a risk: delayed onset can lead to surprise impairment while driving.
Open Container Rule:
- A used joint or opened weed container in the car = fine.
- Best practice: Keep marijuana sealed and in the trunk when transporting.
💊 Prescription & OTC Medications
Even legal meds can impair:
- Opioid Painkillers: Vicodin, OxyContin – cause sedation and confusion.
- Anti-Anxiety Meds: Xanax, Ativan – cause drowsiness and slow reaction time.
- Sleep Meds: Ambien – may lead to “sleep-driving.”
- Cough Syrup w/ Codeine, Benadryl – cause drowsiness.
- Medical Marijuana: A prescription does not excuse DUI.
- Stimulants (e.g., Adderall):
- Prescribed dose may be okay.
- Abuse or high doses = dangerous.
📌 Read labels – “Do not operate heavy machinery” means don’t drive.
⚠️ Mixing Substances
Combining drugs and alcohol:
- Amplifies impairment.
- Example: A drink + painkiller = much worse than either alone.
- Many DUI arrests involve low BAC + drug combo.
👩⚕️ DUI Penalties for Drugs
- Same as alcohol DUI:
- Fines
- License suspension
- DUI education
- Possible jail time
- Counts as a prior offense if repeated (even if next is alcohol)
🚗 Other Drug Rules
- Passengers cannot consume cannabis in the car either.
- Vehicle = public place under these laws.
💤 Drowsiness = Danger
- Extreme fatigue can be as dangerous as drugs or alcohol.
- Could result in reckless driving charges.
👮 Law Enforcement Detection
- Officers look for:
- Eye signs (pupil size, jerking motion)
- Behavior
- Physical signs (pulse, speech, balance)
- Drug Recognition Experts (DREs) may do a 12-step evaluation.
- Refusing a drug test = same or worse license consequences as refusing an alcohol test.
✅ Bottom Line
If it impairs you, don’t drive.
That includes:
- Weed
- Prescriptions
- Cold medicine
- Fatigue
You’re still responsible for what’s in your system. Saying “I didn’t know this cough syrup would affect me” doesn’t excuse unsafe driving.
Be informed. Read labels. Ask your doctor. And if unsure — don’t drive.
Lives, licenses, and futures are at stake. It’s never worth the risk.