Under the Influence of a Controlled Substance: California HS 11550

Quick answer: California Health and Safety Code 11550 prohibits willful unlawful use of specified controlled substances or being willfully and unlawfully under their influence. The substance, timing and alleged conduct matter, and the law contains an exception for authorized administration or direction by a licensed professional. Ordinary subdivision (a) is a misdemeanor, but repeat-treatment and armed-offense provisions can change the consequences. For an arrest, obtain the full charge and current release instructions before assuming that an old bail amount, an automatic jail minimum or a particular treatment option applies.

Updated October 2026. California law checked October 2, 2026, with relevant Judicial Council 2026 jury instructions and a published opinion addressing current use. This guide helps California adult defendants and families understand the charge, prepare useful records and identify the next court or release step. A lawyer can assess an individual case and defense.

In this guide: Understand the charge · Covered substances · Use and influence · Prescriptions · Penalties · Treatment and diversion · Release and bail · Family steps · Bail Hotline help · FAQ · Sources

What Does an HS 11550 Charge Mean?

Health and Safety Code 11550 addresses using or being under the influence of the substances it identifies. It is not the same charge as possessing a drug, possessing it for sale or driving under its influence. One incident can generate several allegations, so the complete paperwork matters more than the family's shorthand description of a drug arrest.

Start with the booking or case number and the exact section and subdivision. Ask whether the information comes from a booking entry, the prosecutor's filed complaint or a later court decision. An initial allegation does not establish guilt or tell you which version of the case the prosecutor ultimately files.

California Courts explains that the prosecutor reviews the police report and decides whether to file charges. The complaint identifies the filed offenses. Obtain that document when available and have counsel explain each count, any alleged prior conviction and whether an ordinary or enhanced provision is involved.

For the family, separate three tasks: locating the person and confirming the current status, understanding the accusation and preserving information relevant to the defense. A bail inquiry can help with the release information. A defense lawyer evaluates the legal and evidentiary questions. The court determines the actual orders and conditions.

Which Substances Does HS 11550 Cover?

Subdivision (a) incorporates specified portions of the controlled-substance schedules, including particular categories and entries in HS 11054 and HS 11055. It also covers a narcotic drug classified in Schedule III, IV or V. That wording should not be shortened to every controlled substance or every medicine that can affect a person.

Examples within the incorporated categories include heroin, cocaine, cocaine base, amphetamine, methamphetamine and phencyclidine, commonly called PCP. Certain hallucinogenic substances are included through specific references, such as mescaline and peyote. Other entries in the same broad schedule are not automatically included merely because they appear nearby.

This matters when a report uses a general category or a street name. Counsel should identify the substance actually alleged and the relevant schedule entry. A description such as stimulant or prescription medication may leave out a fact needed to evaluate the charge. Keep the official charge and any available records together rather than guessing the chemical identity.

Cannabis Is a Separate Question

The current schedule lists cannabis in HS 11054(d)(13), which is not among the subdivision (d) entries incorporated into HS 11550(a). Cannabis use alone should therefore not be treated as the ordinary covered-drug allegation simply because the person was described as under the influence.

That distinction does not resolve every possible cannabis-related charge. Vehicle Code 23152(f) addresses driving under the influence of any drug. Other conduct or another substance can raise its own issue. Read each listed charge instead of assuming that an explanation of HS 11550 answers the whole case.

Some Prescribed Substances Are Covered

A substance can fall within the referenced schedules and also have an authorized medical use. The next question is whether the administration or direction fits the statutory exception. That is why the prescription and its instructions may be important, even when the family recognizes the medicine's name.

The prescription issue should be handled through the actual records and legal test. A bottle, a remembered recommendation and a complete valid prescription can provide different information. Counsel can identify what is needed to evaluate the exception and how it should be presented.

How Do Current Use and Being Under the Influence Differ?

CALCRIM instruction 2400, the Judicial Council's instruction for HS 11550, separates the use route from the under-the-influence route. It identifies willful use of the specified substance, with a relevant short-time-before-arrest qualification, or being willfully under its influence when arrested. Willfully means acting willingly or on purpose.

For the influence route, the instruction describes an appreciable effect on the nervous system, brain or muscles, or a detectable abnormal mental or physical condition caused by the substance. This is a legal description of the alleged condition. It should not be replaced with a family member's general impression that the person looked normal or behaved badly.

Nor does the statute require driving as an element of this charge. A separate drug-driving accusation involves its own requirements under Vehicle Code 23152. Public intoxication under PC 647(f) has a public-place and safety or public-way interference framework. Those provisions should not be blended into one generic drug test.

A Universal Five-Day Rule Is Not the Test

The use allegation concerns current use, not simply proof that a person used a drug at some point in their life. CALCRIM's notes discuss the timing qualification and the evidence relevant to it. A positive result, an observation and a reported date should be evaluated in the context of the actual charge.

In the published part of People v. Jones (1987), the Court of Appeal considered a use-of-heroin conviction rather than an unchanged under-the-influence charge. The court discussed observations, testing evidence and statements about timing, and upheld the conviction on that record. It concluded that evidence supporting use within 48 hours could support current use in those circumstances.

The opinion also distinguished past discontinued use and discussed cases in which older-use or withdrawal evidence did not establish the required issue. Its result does not set a universal two-day or five-day deadline for every substance and every case. Counsel needs the actual evidence, what it is offered to prove and the applicable legal instruction.

Give the lawyer accurate information about dates and existing records. If the family does not know when something happened, say so. Avoid turning an uncertain account into a precise timeline or treating an old article's numerical example as a rule that decides the case automatically.

How Does Prescribed or Authorized Treatment Affect the Case?

HS 11550(a) contains an exception when a covered substance is administered by, or under the direction of, a person licensed by the state to dispense, prescribe or administer controlled substances. It also contains language about the defense showing that the exception applies. The proof question deserves a careful explanation rather than an assumption that all prescription issues work identically.

CALCRIM 2400 supplies a prescription-defense instruction where the evidence supports it. That instruction places the burden on the prosecution to prove beyond a reasonable doubt that there was no valid prescription, and its notes explain the defendant's reasonable-doubt burden concerning lawful use. The statute's exception language should not be rewritten as a requirement that the defendant prove innocence by a preponderance of the evidence.

Counsel can evaluate whether the prescription or authorized direction was valid, the substance it covered and the facts relevant to the alleged use. The family can help locate the existing prescription, label, directions, dates and available administration records. Ask the lawyer which records matter and how to obtain or provide them appropriately.

Keep medical needs and the defense documentation connected to the right people. If the person is in custody, ask the responsible agency how to communicate a current medication or care concern to its medical staff, and inform counsel. A bond inquiry should not be used as a substitute for that care process.

A prescription question can also differ between charges. The HS 11550 exception, a possession exception and a driving allegation each have their own legal setting. For example, a discussion of authorized medication under HS 11550 does not itself decide a separate allegation of driving under a drug's influence. Have counsel explain the actual counts rather than assuming that one document resolves all of them.

What Are the Current HS 11550 Penalties?

The ordinary subdivision (a) offense is a misdemeanor. Its current text provides a county-jail term of no more than one year. Under Penal Code 18.5(a), covered county-jail maxima prescribed as one year are limited to 364 days. The current ordinary provision does not state the old blanket 90-day minimum.

HS 11550(a) also expressly permits probation for up to five years. The general misdemeanor probation rule in PC 1203a has an exception for offenses that prescribe their own probation lengths. Do not replace this statute's express provision with a generic statement about every misdemeanor.

The repeat provision in (b) is specific. It concerns the stated prior convictions under subdivision (a), the timing condition and refusal of a court-offered licensed program. The statute limits the court's ability to remove the 180-day confinement obligation unless no licensed rehabilitation program is reasonably available. For this purpose, a program is not reasonably available if the person must pay more than the court determines they can reasonably afford.

The armed provision also has specific facts. Subdivision (e) identifies unlawful influence of cocaine, cocaine base, heroin, methamphetamine or PCP together with immediate personal possession of a loaded, operable firearm. Its definition includes the interior passenger compartment of a vehicle. A use allegation and an armed-under-influence allegation should not be treated as the same count merely because a gun is mentioned somewhere in the account.

Subdivision (d) authorizes an additional fine up to $70, with the stated ability-to-pay protection. That is not a complete statement of every potential financial obligation or a price for bail. Ask counsel to explain the actual court proposal and any assessments or conditions. A bond agreement is a separate transaction.

These statutory ranges do not predict the result in a particular case. The covered 364-day rule also does not cap state-prison terms, every felony sentence or a combined sentence for multiple counts. Review the complete charging and sentencing picture with counsel.

How Do Treatment and Pretrial Diversion Work?

Treatment can appear in different parts of a drug case. The legal route determines the stage, required decisions, documentation and consequences. Enrollment by itself should not be treated as a court order dismissing the case or changing release conditions.

Treatment Probation for a Qualifying Nonviolent Drug Case

PC 1210 defines the nonviolent drug-possession category to include specified personal use, possession and transportation for personal use, as well as being under the influence in violation of HS 11550. The term excludes possession for sale, production and manufacturing, among the stated exclusions.

Subject to its exclusions, PC 1210.1 requires probation and an appropriate treatment program for a person convicted of a qualifying nonviolent drug-possession offense. Subdivision (a) prohibits incarceration as an additional condition of that probation. This is a reason to examine treatment eligibility before assuming that the ordinary jail maximum predicts the disposition.

The exclusions require their own review. They address specified prior serious or violent felonies and the stated intervening history, another conviction in the same proceeding, the specified armed-with-intent circumstances, refusal of treatment and particular repeated-treatment findings. Do not import one provision's firearm or prior-conviction test into another. Counsel can determine which route and exclusions apply to the actual case.

This framework originated with Proposition 36 in 2000. It is different from the 2024 Proposition 36 possession framework in HS 11395 described below. Ask which section the court is applying, rather than relying on the ballot number alone.

Keep the court's treatment plan and reporting instructions. Treatment probation is a postconviction route with continuing obligations and court oversight. The opening prohibition on jail as an additional probation condition is not a promise that every future violation, another count or separate custody matter can never lead to confinement.

PC 1210 defines qualifying community treatment and specified provider alternatives. Its definition does not include a program offered in a prison or jail facility. Ask counsel whether the proposed provider and plan meet the actual route, rather than treating any course with a drug-treatment label as equivalent.

Rehabilitation as a Sentencing Alternative

HS 11550(c) allows the court, when in the interest of justice, to permit completion of a licensed drug rehabilitation program instead of part or all of county-jail imprisonment for the specified ordinary or repeat cases. The court may require payment of part or all of that program as a sentencing condition.

Ask counsel which program meets the statute, whether a place is actually available and what the proposed order would require. A hoped-for appointment and a confirmed court-approved arrangement are different steps. Keep the provider's information, the order and any completion or reporting instructions together.

For the repeat provision, the offer, refusal and reasonable-availability questions have particular importance. Present accurate information about program cost and what the person can manage. The statute's affordability definition is a court question, not a promise that any particular provider must accept the person for free.

Pretrial Diversion Under Penal Code 1000

PC 1000 includes HS 11550 among specified offenses, subject to eligibility requirements and other applicable exclusions. Its criteria address the stated prior controlled-substance and felony convictions within the five-year period, violence or threatened violence, and contemporaneous drug violations outside the listed offenses. A prior arrest and a qualifying conviction are not interchangeable.

The prosecutor reviews the eligibility criteria and states the determination. PC 1000.1 describes the court process, consent, a not-guilty plea and specified waivers. The court makes the final determination concerning the appropriate education, treatment or rehabilitation route. Participation under this provision is not a conviction or admission of guilt.

The provision describes dismissal upon the required successful completion, recommendation and motion, no sooner than 12 months and no later than 18 months from referral under its stated procedure. The actual order and progress requirements matter. PC 1000.3 provides notice and a hearing for possible termination, and further proceedings when its conditions are established.

HS 11550(g) has its own limitations involving the stated battery charges, specified substances and the armed provision. Its older references to deferred entry and drug court should be read with the current PC 1000 framework. Counsel can identify the available route and its conditions; this guide does not promise diversion for every HS 11550 allegation.

Proposition 36 Possession Treatment Is a Different Route

HS 11395 is the treatment-mandated felony framework for defined hard-drug possession with qualifying prior convictions. It is a possession provision, with a different plea, treatment and court-review process. Do not substitute its rules for an ordinary HS 11550 use or influence charge.

In particular, HS 11550 is not listed among the qualifying prior offenses in HS 11395(c). Prior use convictions alone should not be treated as two automatically qualifying possession-framework priors. A person may have other listed convictions or additional current counts, so have counsel review the actual record.

HS 11395(f) requires judicial review before release for an arrest under that section. If it appears alongside HS 11550, the family must account for that additional requirement. Our drug-possession bail guide explains the broader possession-release and financial process. Here, the important task is identifying which provision actually applies.

How Do Release and Bail Work After an HS 11550 Arrest?

Confirm the responsible holding agency, booking number, full charge and present status. Ask whether the person has been cited and released, whether an appearance or review is pending, or whether a current monetary bail order applies. An old county example cannot settle that question for today's case.

The operative PC 853.6 provides misdemeanor notice-to-appear procedures with exceptions and reasons for nonrelease, including dangerous intoxication, medical-care needs, warrants and the other stated conditions. The misdemeanor label does not guarantee immediate release under every set of facts. If a citation is issued, preserve its appearance and any booking instructions.

At court, the judge addresses the release decision and conditions. The California Courts arraignment guide describes the available kinds of decisions and the defendant's rights, including counsel. Obtain the actual order afterward. A release on a promise to return, supervised release and an authorized monetary bail arrangement are different routes.

When bail is set, PC 1269b distinguishes the warrant, applicable county schedule and judge's order. After the specified court appearance, the judge's amount controls. Ask which current charge and order produced the figure, rather than relying on old Orange County, San Diego or Los Angeles amounts from a past article.

If a commercial bond is proposed, confirm the case and obligation it covers, the complete proposed cost, initial payment, remaining duties and any collateral terms. Keep the signed documents and receipts. The possession guide linked above supplies more detailed financial questions; this page does not publish a bond rate or treat a starting payment as the whole arrangement.

Posting concerns release as to the offense for which the bond is accepted under PC 1269b. Another case, order or custody basis may need separate attention. Confirm what is complete and how the agency will confirm actual release. Treatment participation, completed posting work and a scheduled pickup should not be mistaken for the same checkpoint.

What Should Families Organize for the Next Step?

1. Identify the actual charge and status. Keep the booking and case numbers, full section/subdivision and responsible agency. Distinguish a booking allegation from a filed complaint or entered order.
2. Arrange counsel. A lawyer can review substance identity, current-use or influence evidence, the prescription exception, priors and treatment eligibility. Ask the court about appointed representation if appropriate.
3. Keep accurate existing records. Collect relevant prescriptions and directions, available timing information, notices and prior-case documents. Mark an uncertain date as uncertain rather than guessing.
4. Communicate care concerns properly. Ask the custody agency how to reach the appropriate medical process and inform counsel. Provide accurate information to the identified recipient.
5. Confirm the legal treatment route. Record whether the discussion concerns pretrial diversion, sentencing rehabilitation, HS 11395 or another actual order. Establish the program, approval and required proof of progress.
6. Match release arrangements to the current decision. If a bond is needed, obtain the operative amount and written proposal. Confirm any separate unresolved custody basis before making a pickup plan.
7. Preserve the next dates and conditions. Keep the citation, release notice, court order and program instructions together. Ask counsel or the issuing court to resolve conflicting instructions.

Consider a hypothetical person accused under HS 11550(a) who reports taking a prescribed stimulant. The family helps locate the existing prescription and directions for counsel, while separately confirming the person's current release status. The record can be relevant to the defense without letting the family decide that the case is already dismissed.

In another hypothetical, the booking lists both HS 11550 and HS 11395. Counsel checks the actual possession and prior allegations and the required judicial review. The family obtains the resulting release decision before assuming that a figure associated with the ordinary use allegation is enough to resolve the whole booking.

How Bail Hotline Can Help

Everything above this section is written to be useful whether or not you ever call us. This is the one place we talk about ourselves.

Bail Hotline is a family-owned company founded in 2004. DMCG Inc., doing business as Bail Hotline Bail Bonds, holds California Department of Insurance license 1845394. Our About page explains the company and service network.

When the Drug Charge Leaves the Release Step Unclear

You can contact us for free help with available inmate, bail and court information and general bail guidance, without committing to purchase a bond. Start with the holding agency, booking details and full listed charge. We can help clarify the available information and the next question the family needs to resolve.

If a bond is appropriate, we explain the proposed agreement and walk signers through their responsibilities. Our team provides 24/7 phone and bail-service support, supported online paperwork, dedicated posting assistance and court-date reminders. We help the people assisting coordinate the information and required paperwork.

Larger, complicated and out-of-county matters receive case-specific consideration, with requirements and proposed terms explained. Confirmed progress helps the family plan the next step. The court, surety and holding agency control their respective decisions, and every case needs its own assessment.

Call Bail Hotline at (888) 958-1228 or use our office directory to find an appropriate location. Call ahead to confirm visit arrangements. The office, courthouse, custody agency and treatment provider have different roles.

Frequently Asked Questions

Must the Person Possess Drugs to Be Charged Under HS 11550?

HS 11550 addresses use or influence of the specified substances. A possession charge is a different allegation with its own requirements. One booking may contain both, so read the full record and have counsel explain each count.

Does HS 11550 Cover Every Controlled Substance?

No. Subdivision (a) uses specific schedule references and a narcotic-drug provision for Schedules III, IV and V. Identify the alleged substance and applicable entry instead of applying one explanation to every medicine or drug category.

Does Cannabis Use Alone Fit the Ordinary HS 11550 Charge?

Cannabis appears in HS 11054(d)(13), which is not one of the subdivision (d) entries incorporated by HS 11550(a). That does not decide a driving charge, another substance allegation or other conduct. Confirm the actual counts before relying on the distinction.

Is Any Drug Use Within Five Days Automatically Current Use?

No universal five-day rule decides every case. CALCRIM 2400 and the published Jones opinion address current use, timing and the particular evidence. Counsel can evaluate what the records actually support under the applicable instruction.

Is a Valid Prescription Relevant Even If the Drug Is Listed?

Yes. The statutory authorized-administration exception and CALCRIM's prescription-defense instruction may matter. Provide the actual records to counsel so the exception, validity and proof can be evaluated. Do not assume a general recollection answers every question.

Does Every Ordinary HS 11550 Conviction Require 90 Days in Jail?

The current ordinary subdivision (a) does not state that blanket minimum. It provides the stated misdemeanor maximum and probation option, while the repeat-treatment and armed provisions have different rules. Check which provision and disposition are actually involved.

Do Two Prior HS 11550 Convictions Automatically Trigger HS 11395?

HS 11550 is not included in HS 11395(c)'s list of qualifying prior offenses. Other listed convictions or current possession allegations can change the case. The specific repeat rule in HS 11550(b) also has its own timing and offered-program conditions.

Does Pretrial Diversion Require the Same Plea as HS 11395 Treatment?

The current PC 1000.1 framework describes a not-guilty plea and specified waivers for its pretrial route. HS 11395 describes a different treatment election involving a guilty or no-contest plea and admitted priors. Counsel should explain the actual route before any plea or waiver.

Does Entering Treatment Change the Bail Order Automatically?

Enrollment, a court-approved treatment arrangement and a release order are different decisions. Follow the actual conditions and obtain any court-approved change. Keep program notices and court dates organized even when treatment is underway.

Can I Ask Bail Hotline for Help Before Buying a Bond?

Yes. We provide free help with available inmate, bail and court information and general bail guidance without a commitment to buy a bond. Bring the actual charge and holding-agency information so we can help clarify the next release question.

Sources and Further Reading

• California HS 11550: covered conduct, authorized-use exception, ordinary and special penalties, rehabilitation and program limitations.
• HS 11054 and 11055: referenced substance schedules.
• Judicial Council 2026 CALCRIM, instruction 2400, and People v. Jones (1987): use, influence, timing and prescription proof.
• PC 18.5 and 1203a: covered county-jail limits and probation qualification.
• PC 1210 and 1210.1: qualifying nonviolent-drug treatment probation and statutory exclusions.
• PC 1000, 1000.1 and 1000.3: current pretrial-diversion framework and procedure.
• HS 11395 and VC 23152: material possession-treatment and driving distinctions.
• PC 853.6, 1269b and California Courts arraignment: release and court steps.