Marijuana DUI Lawyer in Chino Hills, CA

Expert Defense for Marijuana DUI Charges Throughout California

Arrested for marijuana DUI in Chino Hills, CA? Despite cannabis being legal for recreational use since 2016 under Proposition 64, driving under the influence of marijuana remains a serious criminal offense under Vehicle Code § 23152(f), carrying the same penalties as alcohol DUI—jail time, license suspension, mandatory DUI programs, probation, and permanent criminal record. Unlike alcohol DUI where 0.08% BAC establishes legal impairment, California has no legal THC limit for driving, meaning officers arrest based on subjective observations of impairment—making false arrests and weak prosecutions far more common.

The Cespedes Law Firm, operating as Abogados Para DUI, provides aggressive marijuana DUI defense throughout California. Attorney Armando Josué Cespedes brings proven cannabis DUI defense experience with a 5.0 client review rating on Avvo and three consecutive Client’s Choice Awards (2023, 2024, 2025).

Marijuana DUI cases are among the most defensible DUI charges in California—no legal THC limit, unreliable testing, and the fact that THC remains in your system long after impairment ends create powerful defenses that experienced attorneys exploit to win dismissals, reductions, and acquittals.

Free Confidential Consultation: (888) 309-3323 | Available 24/7 | Hablamos Español

Office: 13925 City Center Dr, Chino Hills, CA 91709, USA

Understanding Marijuana DUI Law in California

Vehicle Code § 23152(f) – Cannabis DUI

The Law: According to California Legislative Information, VC § 23152(f) makes it unlawful to drive a vehicle while under the influence of any drug, including marijuana.

What Prosecution Must Prove:

1. You drove a vehicle
2. While under the influence of marijuana
3. Your mental or physical abilities were impaired to such a degree you could not drive with the caution of a sober person

No Legal THC Limit: Unlike alcohol (0.08% BAC), California has established NO legal THC blood concentration limit for driving. Prosecution must prove actual impairment—not just presence of THC in your system.

Critical Distinction:

• Alcohol DUI: 0.08% BAC = presumed impaired (per se violation)
• Marijuana DUI: Any THC detected = NOT automatically impaired—must prove actual impairment through officer observations, driving behavior, field sobriety tests

California Marijuana Laws

Legal Recreational Use: Under Proposition 64 (Adult Use of Marijuana Act), adults 21+ may legally possess up to 28.5 grams of cannabis. However, Proposition 64 explicitly did not legalize driving under the influence of marijuana.

Medical Marijuana: Having a valid medical marijuana card provides no defense to marijuana DUI charges. Legal use does not authorize impaired driving under any circumstances.

Penalties for Marijuana DUI in California

First Marijuana DUI Offense

Criminal Penalties:

• Jail: 48 hours to 6 months (typically 2-3 days or none with probation)
• Fines: $390-$1,000 base ($1,800-$2,800 total with penalty assessments)
• DUI Program: 3 months (30 hours) standard
• Probation: 3-5 years informal probation
• License suspension: 6 months

Prior DUI Convictions

Marijuana DUI Counts as Prior: Marijuana DUI conviction counts as prior DUI for 10-year lookback under Vehicle Code § 23622. Second marijuana DUI or marijuana DUI after prior alcohol DUI triggers enhanced mandatory penalties (96 hours jail minimum, 18-month program, 2-year suspension).

Felony Marijuana DUI

When Marijuana DUI Becomes Felony:

• Marijuana DUI causing injury (VC § 23153)
• Fourth marijuana DUI within 10 years (VC § 23550)
• Marijuana DUI causing death (PC § 191.5)

How Police Detect Marijuana DUI

Drug Recognition Experts (DRE)

What Is DRE? Drug Recognition Expert officers are specially trained to identify drug impairment. DRE evaluation involves 12-step protocol including:

• Pulse rate measurement
• Eye examination (pupil size, nystagmus, convergence)
• Divided attention tests
• Muscle tone assessment
• Injection site check
• Overall toxicology opinion

DRE Program: According to California Highway Patrol, California maintains one of the largest DRE programs nationally, with hundreds of certified officers statewide.

Critical Weakness: DRE evaluations are highly subjective—officer’s opinion, not objective scientific measurement. We challenge DRE conclusions aggressively.

Standard Field Sobriety Tests

NHTSA-Standardized Tests:

• Horizontal Gaze Nystagmus (HGN)—limited value for cannabis (marijuana doesn’t cause HGN)
• Walk-and-Turn
• One-Leg Stand

Problem: According to National Highway Traffic Safety Administration, standardized field sobriety tests were developed and validated for alcohol detection—NOT marijuana or other drugs. Their accuracy for detecting marijuana impairment is significantly lower.

Chemical Testing for THC

Blood Testing: California uses blood tests (not breath) to detect THC. Blood draw must be performed by qualified medical personnel.

What Blood Test Measures:

• Delta-9-THC (active form causing impairment)
• THC-COOH (inactive metabolite—does NOT cause impairment)
• Other cannabinoids

Critical Problem: THC metabolites remain detectable in blood for days or weeks after use—long after any impairment has ended. Detection of THC does not equal current impairment.

Powerful Defenses to Marijuana DUI

1. No Impairment—Most Important Defense

The Law Requires Actual Impairment: Since California has no legal THC limit, prosecution must prove actual driving impairment. We attack every element of their impairment evidence.

What We Challenge:

Driving Pattern:

• Normal driving behavior (no weaving, speeding, erratic driving)
• Minor traffic violation insufficient to establish impairment
• Dashcam video showing normal driving

Officer Observations:

• Red eyes explained by allergies, contacts, fatigue
• Odor of marijuana doesn’t prove impairment
• Relaxed demeanor not evidence of impairment
• Slow speech normal for defendant’s personality

Field Sobriety Test Performance:

• Performed well on FSTs (walk-and-turn, one-leg stand)
• HGN not applicable to marijuana
• Medical conditions, anxiety affecting performance

Expert Testimony: Forensic toxicologist testifies that THC level found in blood insufficient to cause impairment, or that blood draw occurred too long after driving to establish impairment at time of driving.

2. THC Detection Does Not Equal Impairment

Scientific Reality: According to National Institute on Drug Abuse, THC blood levels do not reliably correlate with driving impairment because:

• Tolerance: Regular marijuana users maintain high THC blood levels without significant impairment
• Time delay: THC rapidly redistributes from blood to fatty tissue—blood levels drop quickly while impairment continues, then levels remain detectable long after impairment ends
• Individual variation: Same THC level affects different people differently based on tolerance, metabolism, frequency of use

What We Argue:

• THC present in blood from prior use (not recent)
• Regular user with high tolerance shows minimal impairment at detected levels
• Blood draw hours after arrest doesn’t reflect THC level at time of driving

3. Challenge DRE Evaluation

DRE Reliability Challenges:

Subjectivity:

• DRE conclusions based on officer’s subjective opinion, not objective measurement
• Officer already assumed marijuana impairment before evaluation began
• Confirmation bias affects every observation

Protocol Violations:

• DRE failed to follow required 12-step protocol
• Improper pupil measurement (lighting conditions)
• Improper pulse rate measurement
• Inadequate training

Alternative Explanations:

• Medical conditions explaining symptoms (diabetes affecting pulse, eye conditions)
• Fatigue, nervousness explaining observations
• Prescription medications causing similar symptoms

4. Illegal Traffic Stop (Fourth Amendment)

The Law: Officer must have reasonable suspicion you violated law to stop your vehicle.

What We Challenge:

• Stop based on mere hunch or anonymous tip without corroboration
• Pretextual stop (minor violation as excuse for drug investigation)
• Checkpoint violated constitutional requirements

Result: Illegal stop = all evidence suppressed = case dismissed

5. Blood Test Defects

Challenge THC Blood Testing:

Chain of Custody:

• Sample mislabeled, switched, or contaminated
• Improper storage of blood vial
• Documentation gaps in chain of custody

Lab Errors:

• Improper testing procedures
• Equipment malfunction
• Technician errors
• Cross-contamination between samples

Title 17 Violations: California Code of Regulations Title 17 governs blood testing procedures. Violations = unreliable results inadmissible in court.

Independent Testing: We obtain blood vial for independent testing by defense forensic toxicology laboratory.

6. Rising THC Defense

Similar to Rising BAC: THC levels in blood fluctuate based on absorption and distribution patterns. Level at time of blood draw may not reflect level when driving.

Expert Testimony: Forensic toxicologist calculates THC levels at time of driving using pharmacokinetic principles, demonstrating levels were lower (less impairing) while driving than blood draw results suggest.

7. Legal Marijuana Use Not Evidence of Impairment

What We Argue:

• Legal recreational or medical use does not establish impairment
• Possession of marijuana or paraphernalia in vehicle not evidence of impairment while driving
• Prior marijuana use (even admitted) doesn’t prove impaired at time of driving

DMV Hearing for Marijuana DUI

Separate Administrative Proceeding

10-Day Deadline: Must request DMV hearing within 10 days of marijuana DUI arrest. Failure = automatic license suspension on day 31.

DMV Hearing Issues for Marijuana DUI:

1. Did officer have reasonable cause to stop vehicle?
2. Was there probable cause to arrest for marijuana DUI?
3. Were you driving under influence of marijuana?

Key Difference from Alcohol DUI: No per se THC limit—DMV must prove actual impairment, not just THC detection. This makes marijuana DUI DMV hearings more defensible than alcohol DUI hearings.

According to California DMV, license suspension for marijuana DUI follows same administrative per se process as alcohol DUI.

Why Choose The Cespedes Law Firm for Marijuana DUI Defense

Specialized Cannabis DUI Knowledge

• Deep understanding of THC pharmacokinetics
• Know how to challenge DRE evaluations effectively
• Forensic toxicologist experts retained
• Stay current on evolving marijuana DUI science

Challenge Every Element

• Attack impairment evidence aggressively
• Challenge DRE protocol violations
• Contest blood test reliability
• Present expert testimony on THC and impairment

Proven Results

• 5.0 client review rating on Avvo
• Three consecutive Client’s Choice Awards
• Numerous marijuana DUI dismissals and reductions

Statewide California Practice

• Serve clients throughout California
• Los Angeles, Orange, Riverside, San Bernardino, Kern, San Diego, Sacramento Counties

Bilingual Services

• Complete representation in Spanish (Hablamos Español)

Frequently Asked Questions

Is marijuana DUI the same as alcohol DUI in California?

Same penalties apply, but marijuana DUI is more defensible—no legal THC limit, unreliable testing, THC detectable long after impairment ends.

What is the legal THC limit for driving in California?

None. California has established no legal THC blood concentration limit. Prosecution must prove actual impairment.

Can I be arrested for marijuana DUI if I used cannabis legally?

Yes. Legal recreational or medical use doesn’t authorize impaired driving. However, legal use doesn’t automatically prove impairment either.

Does marijuana DUI count as prior DUI?

Yes. Counts as prior DUI for 10-year lookback under VC § 23622.

Can marijuana DUI be reduced to wet reckless?

Yes, in cases with weak impairment evidence, borderline THC levels, or strong legal defenses.

How long does THC stay in blood?

THC detectable in blood for days or weeks after use—long after impairment ends. Detection alone doesn’t prove impairment while driving.

What is a Drug Recognition Expert (DRE)?

Specially trained officer evaluating drug impairment. DRE evaluations are highly subjective and frequently challenged successfully.