California Penal Code 381b makes it a misdemeanor to possess nitrous oxide with the intent to inhale it for intoxication, or to knowingly be under its influence for that purpose.1California Legislative Information. California Penal Code 381b Because the statute sets no penalties of its own, a conviction carries California’s default misdemeanor sentence: up to six months in county jail, a fine of up to $1,000, or both.2California Legislative Information. California Penal Code 19
The Two Ways to Violate 381b
The statute creates two separate offenses. The first is possessing nitrous oxide, or anything containing it, with the intent to inhale it to get high. The second is knowingly being under the influence of nitrous oxide for that same purpose.1California Legislative Information. California Penal Code 381b
You do not have to be caught mid-inhale. Holding canisters alongside evidence of recreational intent can satisfy the possession prong on its own. Being visibly intoxicated on the gas can satisfy the “under the influence” prong even if no one saw you use it. A person found stumbling near a pile of spent cartridges at a party is exposed under the second prong regardless of whether anyone witnessed the inhalation.
How Prosecutors Prove Intent
The possession charge requires specific intent. Having a box of nitrous oxide cartridges in your kitchen is not a crime by itself, because the intent element is missing. The prosecution has to show you held the substance to inhale it for intoxication or a similar mind-altering effect.1California Legislative Information. California Penal Code 381b
That proof almost always comes from circumstantial evidence. Balloons, “crackers” (small handheld devices designed to puncture nitrous cartridges), and clusters of spent cartridges with no tie to food preparation or a professional setting all point toward recreational use. Paraphernalia nearby makes the prosecution’s job much easier.
The “under the influence” prong carries its own mental-state requirement: you must have been knowingly and intentionally intoxicated on nitrous oxide. Accidental exposure in a workplace or medical setting does not count.
The Medical and Dental Exemption
Penal Code 381b contains exactly one written exemption. The law does not apply to anyone under the influence of nitrous oxide when it was administered for medical, surgical, or dental care by a practitioner licensed in California.1California Legislative Information. California Penal Code 381b
Read the exemption narrowly. It protects you from the “under the influence” prong after a procedure where nitrous oxide was used as a sedative. It is not a broad shield for healthcare workers who possess the gas, though those workers do not run afoul of 381b because they lack the recreational intent the statute requires.
Food-service use is not written into 381b as a separate exemption. A chef or caterer who keeps nitrous oxide cartridges for whipped cream dispensers does not violate the statute because, again, the intent to inhale recreationally is missing. The intent requirement itself does the work. A related statute, Penal Code 381c, explicitly exempts nitrous oxide sold as a propellant in food products, but that provision governs sales to minors rather than personal possession.3California Legislative Information. California Penal Code 381c
Penalties If You Are Convicted
A 381b violation is a misdemeanor. Default California misdemeanor penalties under Penal Code 19 apply: up to six months in county jail, a fine of up to $1,000, or both.2California Legislative Information. California Penal Code 19 Court assessments and fees typically push the total financial cost well above the base fine.
Judges often impose summary probation instead of jail, especially for a first offense. Summary probation in California is usually unsupervised, so you do not report to a probation officer. It typically lasts one to two years and may include community service, substance-abuse counseling, or drug testing. If you violate the terms, the judge can revoke probation and impose the original jail sentence.
Clearing the Record Afterward
A conviction creates a permanent criminal record unless you obtain an expungement. Under Penal Code 1203.4, a person who successfully completes probation or their sentence for a misdemeanor can petition the court to withdraw the guilty plea and dismiss the case. An expungement does not erase the record entirely, but it releases you from most of the penalties and disabilities that follow a conviction, which matters for job applications and professional licensing.
Related: Giving Nitrous Oxide to a Minor
If your situation involves a sale or hand-off to someone under 18, you are looking at a different statute. Selling, giving away, or distributing nitrous oxide to anyone under 18 is a separate misdemeanor under Penal Code 381c. The court is required to consider ordering community service as a condition of probation, and a second conviction can trigger suspension of the seller’s business license for up to one year.3California Legislative Information. California Penal Code 381c
Sellers have an affirmative defense if they honestly and reasonably believed the buyer was at least 18, but they bear the burden of proving that belief. The statute also lets any seller refuse a sale when the buyer cannot produce adequate proof of age.3California Legislative Information. California Penal Code 381c