Short answer
In states with legal adult-use cannabis, possession by a person under 21 is a civil violation in most cases. Common penalties are a fine of $100 to $200, a drug education class, or community service. Jail time for a small amount is rare. In states where cannabis stays illegal, the same conduct can be charged as a misdemeanor and can create a criminal record.
The age line is 21
Every state with a legal adult market sets the minimum age at 21. An 18-year-old can vote, sign a contract, and join the military. That person still cannot buy, hold, or use cannabis in a legal state. A medical cannabis card does not remove the age limit in most states. A minor who uses cannabis for medical reasons needs a parent or guardian as caregiver, and the rules differ by state.
Penalties in states with legal sales
State law sets the penalty. Amount, location, and prior offenses change the outcome.
- California: Possession of up to 28.5 grams by a person under 21 is an infraction. The fine is up to $100, or drug education, or both. A person under 18 can be ordered to counseling or community service.
- Colorado: Possession of up to 2 ounces by a person under 21 is a petty offense. The fine is up to $100. Larger amounts move to a higher charge.
- Massachusetts: A first offense brings a $100 civil penalty and a drug awareness program. Skipping the program raises the cost to $1,000.
- Illinois: Possession of up to 30 grams by a person under 21 is a civil law violation. The fine runs from $100 to $200.
In each of these states, the product is seized. A first offense for a small amount does not carry jail time.
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States with no legal market
Where cannabis is fully illegal, underage possession falls under the general possession statute. A small amount is a misdemeanor in most of these states. Penalties include a fine, probation, and a short jail term. Court costs often exceed the fine. A conviction stays on the record unless the state allows expungement.
Federal penalties
Cannabis sits on Schedule I of the Controlled Substances Act. Simple possession of any amount is a federal misdemeanor. A first offense carries up to 1 year in prison and a minimum fine of $1,000. Federal prosecutors bring charges for simple possession in few cases. No federal statute treats underage possession as a separate crime.
Under 18 versus 18 to 20
A 17-year-old goes through juvenile court in most states. The court notifies a parent or guardian. Options include diversion, counseling, and community service. The record can be sealed or expunged. A person age 18 to 20 goes through the adult civil process or adult criminal court.
What raises the penalty
- Amount above the state limit for personal use.
- Possession on school grounds or inside a school zone.
- Possession in a vehicle, which can add a separate charge.
- A second or third offense within a set period.
- A fake ID used to buy cannabis. The ID brings its own charge.
- Product split into several bags, which can support an intent-to-sell charge.
Giving cannabis to a minor is a separate crime
Every legal state punishes an adult who supplies cannabis to a person under 21. The penalty for the adult runs higher than the penalty for the minor. It includes fines in the thousands, probation, and jail. A licensed store that sells to a minor risks suspension or loss of its license.
Consequences beyond the fine
- Driver's license: several states suspend or delay a license for an underage cannabis violation.
- School: conduct codes can trigger suspension or loss of campus housing.
- Employment: a criminal record can block jobs that require a background check.
- Immigration: a drug conviction can affect a visa or a green card.
- Record: a civil infraction does not create a criminal record. A misdemeanor does.
What to do after a charge
Read the citation. It names the charge, the fine, and the court date. Show up on that date. Ask the court about a diversion or education program. Many courts drop or reduce the charge after the program is complete. Talk to a lawyer if the charge is a misdemeanor or if the amount is above the state limit.
Laws change. Fines and programs differ by county. Confirm the current rule with a lawyer in your state.