California Health and Safety Code 11357 HS - Possession of Marijuana Laws

California Health and Safety Code 11357 HS primarily governs personal possession of cannabis and concentrated forms like hashish, wax, or vape cartridges within the state.

Although Proposition 64 legalized recreational cannabis for adults in California, violating certain thresholds related to age, quantity, or location can still lead to criminal infractions or misdemeanors.

HS prohibits the “unlawful” possession of marijuana in California. However, adults aged 21 and older can legally possess up to 28.5 grams of dried marijuana or up to 8 grams of concentrated cannabis (hashish).

However, possessing quantities above these limits, any amount of marijuana by minors under 21, or marijuana on K-12 school property, constitutes a criminal offense.

Cron, Israels & Stark can help you. Schedule your consultation today at (424) 372-3112.

Core Legal Thresholds under HS 11357

Under California law, adults 21 and older are legally allowed to possess personal-use amounts of cannabis. Criminal charges under HS 11357 occur if individuals exceed these limits, are underage, or carry cannabis in restricted areas.

1. Legal Limits for Adults (21 and Older)

• Cannabis Flower: Up to 28.5 grams (approximately 1 ounce).

• Concentrated Cannabis: Up to 8 grams (e.g., dabs, wax, shatter, hash, or vape oil).

• Penalty for compliance: No penalty. Possession within these quantities is entirely legal for personal use.

2. Penalties for Exceeding Legal Limits (Over 28.5g Flower / 8g Concentrate)

• Adults (Age 18+): Charged as a misdemeanor, punishable by up to 6 months in county jail and/or a maximum fine of $500.

• Minors (Under Age 18): Charged as an infraction, requiring mandatory drug education or counseling and community service (no jail time or monetary fines).

3. Underage Possession (Under 21) within Legal Limits

• Individuals aged 18 to 20: Charged with an infraction, punishable by a maximum fine of $100.

• Minors under 18: Charged with an infraction, carrying mandatory drug education and community service obligations.

4. Possession on K-12 School Grounds

Possessing any amount of cannabis on the grounds of a school (K-12) while it is open for classes or school-related programs is strictly prosecuted:

• Adults (Age 18+): A first offense results in a fine of up to $250. For subsequent violations, they are considered misdemeanors, carrying fines up to $500 and potential jail time of up to 10 days in county jail. 

• Minnors (Under 18): An infraction requiring drug counseling and community service.

Prosecution Elements: What Must Be Proved?

To secure a conviction for illegal possession of marijuana under HS 11357, the prosecution must prove the following legal elements beyond a reasonable doubt:

1. Unlawful Possession: The defendant exercised control over or had the right to control the cannabis.

2. Knowledge of Presence: The defendant knew the substance was present.

3. Knowledge of Nature: The defendant was aware of the substance's nature or character as a controlled substance.

4. Excessive Quantity or Prohibited Status: The substance was cannabis weighing more than 28.5 grams, concentrated cannabis weighing more than 8 grams, or the defendant was under 21 or on school grounds.

5. Usable Amount: The quantity of cannabis was enough to be consumed as a drug (useless traces, debris, or residue do not qualify).

Penalties and Sentencing

Offense Context	Charge Type	Maximum Fine
Adult (21+) within limits (<28.5g flower / <8g concentrate)	Legal	$0
Adult (18+) over limits (>28.5g flower / >8g concentrate)	Misdemeanor	$500
Youth (18–20) within limits (<28.5g flower / <8g concentrate)	Infraction	$100
Minor (Under 18) any amount (Everywhere except schools)	Infraction	$0
Adult (18+) on K-12 School Grounds (First Offense)	Infraction	$250
Adult (18+) on K-12 School Grounds (Subsequent Offense)	Misdemeanor	$500

Related California Cannabis Laws

Marijuana possession charges often overlap with or are escalated to other sections of the California Health and Safety Code or Vehicle Code.

• HS 11358 – Unlawful Cultivation of Cannabis: Adults 21+ may grow up to 6 live plants per residence. Cultivating more than 6 plants without a commercial license is generally a misdemeanor punishable by up to 6 months in jail and a $500 fine.

• HS 11359 – Possession of Cannabis with Intent to Sell: Possessing cannabis in any amount with the intent to sell it without a legal commercial licensing is a misdemeanor. It escalates to a felony if the individual has prior serious convictions or uses minors to assist in sales.

• HS 11360 – Unlicensed Sale or Transportation of Cannabis: The unlicensed commercial sale, gift, or transport of cannabis is a misdemeanor. Gifting up to 28.5 grams to another adult over 21 without compensation is legal.

• VC 23222(b) – Open Container of Cannabis in a Vehicle: Driving a motor vehicle with an open enclosure, receptacle, or package of cannabis or cannabis products is an infraction carrying a fine of up to $100.

• VC 23152(f) – Driving Under the Influence of Drugs (DUI): Operating a vehicle while impaired by the active compounds of cannabis is a criminal offense carrying the same severe penalties as an alcohol-based DUI.

Under California Health and Safety Code 11357(c) HS, possessing marijuana on school grounds during operating hours is a separate criminal offense.

Legal Defenses against HS 11357 Charges

Experienced criminal defense attorneys utilize several strategies to fight charges of illegal marijuana possession:

• Medical Marijuana Authorization (Compassionate Use Act): Under Prop 215, qualified patients and primary caregivers with a valid medical recommendation can carry more cannabis than recreational limits, provided it's reasonably related to the patient's medical needs.

• Lack of Knowledge: If the defendant was truly unaware that the cannabis was in their vehicle, luggage, or clothing—such as a passenger leaving it behind—the knowledge requirement is not fulfilled.

• Lack of Possession / Control: Simply being close to marijuana does not count as possession. If the cannabis was solely owned by someone else in a shared area, the defense can argue the lack of control.

• Fourth Amendment Violations (Illegal Search and Seizure): If law enforcement found the cannabis during an illegal traffic stop, without a proper search warrant, or by exceeding the limits of an implied consent search, the evidence could be excluded under the exclusionary rule.

Frequently Asked Questions (FAQs)

Can I be arrested for possessing a cannabis vape cartridge in California?

You are only subject to legal restrictions if you exceed the limit or are underage. A vape cartridge contains concentrated cannabis. Adults aged 21 and older can legally possess up to 8 grams of concentrate. Possessing more than 8 grams or being under 21 may lead to criminal penalties under HS 11357.

Does a conviction for HS 11357 qualify for drug diversion?

Yes. If you're charged with a misdemeanor for possessing more than the legal limit, you are typically eligible for California drug diversion programs like Penal Code 1000. Completing the program successfully usually leads to the dismissal of the charges.

Can employers still fire me for cannabis possession outside of work?

Yes, within certain boundaries. California law shields employees from discrimination due to off-duty cannabis use, but employers can still enforce a drug-free workplace policy, ban use or possession on company property, and discipline employees who are visibly impaired at work.

Is it legal to carry marijuana in my car?

Yes, as long as it stays within the legal limits (28.5g of flower or 8g of concentrate) and remains in a sealed, unopened container. If the container or packaging has been opened or the seal broken, it must be stored in the trunk of the vehicle to prevent violating Vehicle Code 23222(b) for an open container.

What happens if a 19-year-old is caught with an ounce of weed?

Because the individual is over 18 but under 21, possession of less than 28.5 grams is classified as an infraction. They will not face jail time but will be subject to a fine of up to $100.

Hypothetical Case Examples

Scenario A: The Scale Calibration Issue

An adult driver is pulled over for a broken taillight. Officers find a bag of cannabis in the trunk. At the scene, the officer's field scale shows it weighs 29.1 grams, and the driver receives a citation for a misdemeanor under HS 11357(b).

In court, the defense attorney requests the police scale's calibration records. A certified laboratory test shows the actual weight of the organic material was 28.1 grams. Since this is under the legal threshold of 28.5 grams, the misdemeanor charges are fully dropped.

Scenario B: Unconstitutional Search of a Backpack

A 22-year-old college student is walking past a public K-12 school during school hours when a school resource officer, acting on an arbitrary "hunch," stops and searches their backpack without consent or probable cause, finding 5 grams of concentrated cannabis oil.

The student faces a misdemeanor charge under HS 11357(c) for possession on school grounds. The defense files a motion to suppress evidence, arguing that the officer lacked reasonable suspicion for the initial detention and search. The court rules the search unconstitutional, suppresses the physical evidence, and dismisses the case.

Speak with a California Drug Crime Defense Lawyer

Although California's cannabis laws are generally seen as progressive, Health and Safety Code 11357 HS still includes legal pitfalls that could lead to a permanent criminal record, hefty fines, or imprisonment. This is particularly true if allegations pertain to school zones, concentrated cannabis, or suspected intent to sell.

If you or a loved one are dealing with an investigation or criminal charges related to a drug offense, it's crucial not to face the justice system alone. An experienced California criminal defense lawyer can thoroughly assess the details of your case.

The Los Angeles-based criminal defense attorneys at Cron, Israels & Stark are here to help you. Schedule your consultation today.