Under the Influence of a Controlled Substance (HSC § 11550) | California Drug Defense

Related possession law begins below. The remaining § 11350 discussion concerns possession, not the separate § 11550 use or current-influence charge. If both appear in the complaint, each count needs its own evidence and eligibility review.

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Related possession allegation: Health and Safety Code § 11350

If possession is also charged: evaluate the § 11350 evidence and possible consequences separately

This related § 11350 possession discussion concerns a different charge from § 11550 use or current influence. The Law Offices of David S. Chesley can evaluate drug-charge defense, current PC 1000 diversion, suppression issues and the filed case; a prior result does not predict this one.

If the paperwork also cites § 11350: preserve these possession-case records

• Do not make statements to law enforcement or prosecutors without counsel — statements about your knowledge of the substance or its presence are the prosecution's most important evidence and can establish the elements they need to prove
• Before accepting a plea, ask counsel to compare the charged § 11350 possession offense with current PC 1000 eligibility, other diversion statutes and evidentiary defenses. The appropriate choice depends on the filed case and individual consequences.
• Preserve documentation of the arrest circumstances — any witnesses, evidence relevant to your knowledge of the substance or its presence, and any treatment you have already started
• Contact experienced counsel immediately — timing matters for diversion windows, suppression evidence preservation, and immigration analysis before any plea

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THE STAKES ARE REAL

A § 11350 conviction can affect employment, licensing, immigration and other matters; the actual offense, disposition, agency rules and individual history determine the consequences.

• Up to 1 year in county jail plus fines and fees
• An arrest or conviction can affect some background checks, employment and licensing reviews; the actual disposition, record rules and applicable exceptions control.
• Professional licensing review or reporting may apply depending on the board, occupation, offense and disposition; it is not mandatory for every license holder.
• Immigration consequences — deportation risk for non-U.S. citizens; HS § 11350 is a controlled substance offense under federal immigration law
• Loss of federal financial aid and potential public housing eligibility consequences

Note on current law (2026): Most simple possession remains a misdemeanor, but Proposition 36 allows felony treatment-mandated charging for some repeat hard-drug cases — with potential dismissal pathways upon successful treatment.

Successful participation in drug diversion programs or a suppression ruling can change the criminal case, but neither automatically eliminates licensing, immigration or record consequences. Review the order and applicable agency rules.

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WHAT THE PROSECUTION MUST PROVE — AND HOW TO CHALLENGE IT

To convict under HS § 11350, the prosecution must prove beyond a reasonable doubt:

1. You possessed a controlled substance — actually or constructively
2. You knew of its presence
3. You knew its nature as a controlled substance
4. It was a usable quantity; useless traces or debris do not suffice, but a small usable amount may.
5. The alleged substance was one covered by § 11350; laboratory results can be important evidence, but a particular test is not itself a statutory element.

Each element is independently challengeable. Defeating any one defeats the charge entirely.

Key Defenses at a Glance:

• Current PC 1000 pretrial diversion and other eligible paths: completion and dismissal depend on the statute, court order and program conditions.
• Search challenge under Penal Code § 1538.5: if evidence is suppressed, counsel must assess what admissible proof remains; dismissal is not automatic.
• Lack of knowledge: You didn't know it was there or didn't know what it was
• Usable-quantity challenge: useless traces or debris are insufficient, but a small amount can qualify if usable; potency and ability to produce a drug effect are not required.
• Valid prescription: check authorization by a California-licensed physician, dentist, podiatrist, naturopathic doctor or veterinarian where applicable, and the actual substance and prescription.
• Constructive possession challenge: shared space alone does not prove the defendant controlled or had a right to control the substance; exclusive access is not required for guilt.

Quick Diversion Comparison for HS § 11350 Cases:

Call (800) 755-5174 for a free assessment of every available pathway.

INDIVIDUAL DEFENSE EXPLANATIONS — HOW EACH DEFENSE WORKS

Defense One: Current PC 1000 and Other Diversion Paths

For an eligible § 11350 possession charge, current PC 1000 is a pretrial diversion option under Penal Code §§ 1000–1000.1. It begins with a not-guilty plea, not the former Deferred Entry of Judgment guilty-plea process. Satisfactory completion, a positive recommendation and the required motion lead to dismissal under the statute; check the actual order and record exceptions.

For defendants who do not qualify for PC 1000, alternative pathways — PC § 1001.95 misdemeanor diversion, Proposition 36, drug court, military diversion under PC § 1001.80, and mental health diversion under PC § 1001.36 — are assessed and pursued in every case. PC 1000 ineligibility does not end the diversion analysis.

Non-U.S. citizens should obtain criminal and immigration advice before any admission, plea or diversion agreement. Federal immigration treatment may differ from a California dismissal; current PC 1000 does not require the old Deferred Entry of Judgment guilty plea.

Defense Two: Illegal Search and Seizure — PC § 1538.5 Suppression

A § 11350 investigation may involve a search of a person, vehicle, home or belongings. Counsel can test the warrant, consent, stop and seizure facts through a suppression motion under Penal Code § 1538.5. If a court suppresses evidence, the effect on the charge depends on the remaining admissible proof and further proceedings; dismissal does not necessarily follow immediately.

Common suppression grounds in HS § 11350 cases include: warrantless vehicle searches lacking probable cause, warrantless home entries without valid exigent circumstances, consent obtained under coercive circumstances or from a person who was unlawfully detained, searches exceeding the scope of a warrant, unlawful traffic stops as the foundation of the search, and warrantless cell phone searches in violation of Riley v. California. A Franks v. Delaware challenge to the warrant affidavit is pursued in every case where the affidavit's factual foundation appears inaccurate — because a warrant invalidated through a Franks challenge suppresses all evidence seized under it.

Defense Three: Lack of Knowledge — The Defendant Did Not Know the Substance Was Present

HS § 11350 requires proof the defendant knew the controlled substance was present. A defendant who was unaware of the substance's existence — in a borrowed vehicle, in a bag carried for someone else, in a shared residence, or in any location where others had access — did not have the required knowledge element and is not guilty. The lack of knowledge defense is developed through evidence of the circumstances of the discovery, the defendant's relationship to the location, the presence of others with access, and any evidence consistent with genuine lack of awareness.

Defense Four: Lack of Knowledge of Nature — The Defendant Did Not Know What the Substance Was

Even where the defendant knew a substance was present, HS § 11350 requires proof the defendant knew it was a controlled substance. A defendant who genuinely believed the substance was a legal supplement, an authorized medication, or any substance other than an illegal controlled substance did not have the required knowledge of nature. This defense applies in cases involving substances not commonly recognizable in their specific form, transactions the defendant believed were legitimate, and prescription medications the defendant genuinely believed were valid.

Defense Five: Usable Quantity — Useless Traces and Usable Small Amounts

A § 11350 possession count requires a usable amount of the charged substance. Useless traces or debris are not enough, but a small amount can be usable without being potent enough to affect a person. Counsel can examine the amount, packaging, laboratory evidence if obtained and other proof rather than assume every residue is legally unusable.

Defense Six: Valid Prescription

A valid prescription can defeat a § 11350 possession allegation when it covers the substance and possession at issue. CALCRIM 2304 identifies a California-licensed physician, dentist, podiatrist, naturopathic doctor or veterinarian as an authorized prescriber where applicable. Counsel should review the prescription, provider authority, dates, quantity and any genuine knowledge issue.

Defense Seven: Constructive Possession Challenge

Constructive possession concerns control or the right to control the substance, not exclusive control of the place where it was found. Two or more people may possess the same substance simultaneously. In a shared vehicle, home or common area, counsel can examine access, statements, fingerprints, placement and other facts bearing on the defendant’s knowledge and control; shared occupancy alone does not prove possession.

Defense Eight: Laboratory Analysis Challenge

The prosecution must prove the substance identity, but CALCRIM 2304 does not require proof by a particular laboratory test. If testing was performed, counsel can examine the method, chain of custody, contamination and identification; if no test was performed, counsel can evaluate the other evidence offered to establish the charged substance.

HS § 11350 AND IMMIGRATION — CRITICAL ANALYSIS FOR NON-U.S. CITIZENS

HS § 11350 is among the most immigration-consequential misdemeanor convictions available in California criminal law — and for non-U.S. citizens, the immigration analysis must be conducted from the very first consultation before any plea is entered.

The Federal Immigration Consequences of HS § 11350

Under federal immigration law, an HS § 11350 conviction is:

• A § 11350 possession charge is not categorically a crime involving moral turpitude. Immigration consequences require analysis of the particular offense, substance, disposition and immigration history.
• A controlled-substance conviction can trigger serious federal immigration consequences, with statutory exceptions and fact-specific questions. Neither deportation nor detention follows automatically from every § 11350 allegation.

Even a misdemeanor drug case can affect immigration status, licensing and work. The statute, substance, disposition and personal history matter; obtain individual advice before a plea or admission.

Current PC 1000 pretrial diversion and immigration questions

The current PC 1000 process begins with a not-guilty plea under Penal Code § 1000.1. A non-U.S. citizen still needs individual advice about any admissions, treatment terms, later disposition and federal immigration rules before choosing diversion.

What Non-U.S. Citizens Must Do Before Any Plea:

• The immigration consequences of the specific HS § 11350 charge must be analyzed before any plea is entered — including the specific controlled substance alleged and its immigration classification
• Ask counsel to assess the immigration implications of the actual PC 1000 application, statements and disposition, rather than relying on the former guilty-plea Deferred Entry of Judgment description.
• Other diversion statutes may have different admission and eligibility rules. Counsel should compare them with current PC 1000 and obtain immigration advice; no route can be labeled immigration-safe in the abstract.
• Suppression motions that produce dismissal without any plea are frequently the most immigration-protective outcome in cases where the search was unconstitutional — because a suppression dismissal involves no plea of any kind

Immigration analysis for non-U.S. citizens is conducted from the very first consultation in every HS § 11350 case. The immigration consequences of this specific charge are too serious and too permanent to address only after the most consequential plea decision has already been made.

HOW DAVID CHESLEY DEFENDS HS § 11350 CASES

Ask the Law Offices of David S. Chesley who would handle the case and how diversion, search issues and possession elements would be assessed in the specific court.

Core strategies pursued immediately:

Diversion eligibility assessed from day one — PC 1000 eligibility analyzed for the specific charge and prior record; where PC 1000 is unavailable, every alternative pathway assessed and pursued.

Search and seizure challenge identified and evidence preserved immediately — every search examined from the first consultation; dashcam, body camera, and surveillance footage preservation demands issued before footage is overwritten.

Knowledge element examined on specific facts — the circumstances of discovery, the defendant's relationship to the location, the presence of others with access, and every available piece of evidence bearing on actual knowledge.

Immigration analysis for every non-U.S. citizen defendant — immigration consequences of the charge and every available plea analyzed before any plea is entered; no-plea alternatives identified and pursued where appropriate.

All defenses pursued simultaneously — diversion, suppression, and knowledge challenges are not mutually exclusive; the strongest defense on the specific facts is identified while all others remain available.

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YOU HAVE RIGHTS. USE THEM.

The prosecution must prove each element of the charged § 11350 offense. Counsel can examine possession, knowledge, the laboratory result, search authority and any prescription; the available defense depends on the evidence.

• Firm-reported § 11350 example: a PC 1000 program was completed and the charge dismissed. Current PC 1000 does not require the former guilty plea; arrest-record and licensing effects depend on Penal Code § 1000.4, its exceptions and the actual order.
• Firm-reported search example: a traffic stop was found unlawful, evidence was suppressed and the charge was dismissed. A different case may have other admissible evidence, so suppression does not guarantee dismissal.
• Franks challenge succeeded — warrant affidavit contained material inaccuracies; warrant invalidated; all evidence suppressed; charge dismissed
• Knowledge element defeated at trial — heroin found in borrowed vehicle; prosecution unable to prove knowledge beyond a reasonable doubt; not guilty verdict
• Firm-reported example: counsel sought an alternate diversion route for a non-U.S. citizen. No program or dismissal guarantees immigration protection; the facts and federal treatment of the disposition require individual advice.
• Firm-reported shared-apartment example: the prosecution did not establish the defendant’s knowledge and control or right to control the cocaine; the charge was dismissed before trial. Exclusive control of the premises is not a legal element, and this result is not a prediction for another case.
• Felony charge correctly reduced to misdemeanor — prior conviction incorrectly characterized as qualifying felony; Proposition 47 analysis applied; charge reduced; felony consequences eliminated
• Mental health diversion granted — defendant with PTSD whose substance use was connected to underlying condition; PC § 1001.36 diversion pursued; charge dismissed; root cause addressed

WHY CLIENTS CHOOSE DAVID CHESLEY

Direct, personal attention — statewide, 24/7

David Chesley personally handles HS § 11350 defense in criminal courts across all of California — Los Angeles, San Diego, Orange County, San Francisco, Sacramento, Fresno, San Jose, Riverside, San Bernardino, Ventura, and every other jurisdiction statewide. Available 24 hours a day, 7 days a week — because diversion windows close fast, suppression evidence is overwritten quickly, and the decision of whether to enter any plea must be made with full information before the court date arrives.

Some § 11350 cases turn on diversion eligibility; others turn on the search, proof of possession or laboratory identification. Counsel should assess these paths together before recommending a disposition.

Multi-front strategy from day one

Diversion, suppression, and knowledge challenges are identified and assessed simultaneously. Many defendants who could have pursued a suppression motion defaulted to diversion because no one assessed the search. Many non-citizens entered an immigration-risky PC 1000 plea because no one identified the no-plea alternative. Every available defense is pursued from the first consultation.

Flexible payment plans

The Law Offices of David Chesley offer flexible payment plans because cost should never be the reason someone charged with HS § 11350 goes without experienced legal representation to pursue the defense their case deserves.

Representative Results:

• Firm-reported cocaine-possession example: a program was completed and a dismissal followed; a nursing-license application was later approved. That historical result is not a promise of dismissal, sealing, reporting relief or licensing approval for another person.
• Firm-reported cocaine-possession example: a traffic-stop challenge led to suppression and dismissal. The effect of a suppression ruling in another case depends on the remaining evidence and court proceedings.
• Franks challenge succeeded — search warrant for residence where cocaine was found contained material factual inaccuracies; Franks hearing held; warrant invalidated; all evidence suppressed; charge dismissed
• Knowledge element defeated at trial — heroin found in shared vehicle; prosecution unable to prove defendant knew heroin was present; not guilty verdict returned at trial
• Firm-reported lawful-permanent-resident example: an alternate diversion statute was considered and a dismissal reported. Immigration consequences depend on the individual record and federal law; no pathway guarantees preserved status.
• Firm-reported shared-apartment example: the prosecution did not establish the defendant’s knowledge and control or right to control the cocaine; the charge was dismissed before trial. Exclusive control of the premises is not a legal element, and this result is not a prediction for another case.
• Felony HS § 11350 charge correctly reduced to misdemeanor — prior conviction incorrectly characterized as qualifying felony enhancement; Proposition 47 analysis applied; charge reduced to misdemeanor; felony consequences including state prison exposure eliminated
• Firm-reported mental-health-diversion example: treatment was completed and a charge dismissed. Whether an arrest record can be sealed and whether professional reporting is required depend on the statute and order in an individual case.

Client Feedback:

"I was charged with cocaine possession and panicked about my nursing license. David identified PC 1000, made sure I was eligible before any plea was entered, guided me through the entire 18-month program, and the charge was dismissed with no conviction. My license application was approved. I had no idea this outcome was possible." — Anonymous former client

"The search was illegal. I was stopped for a minor traffic issue and my car was searched without any real reason. David showed the stop and the search were both unconstitutional, suppressed the cocaine evidence, and the case was dismissed immediately. No program, no plea, no record." — Anonymous former client

A testimonial published with this article describes concern about an earlier PC 1000 guilty-plea process and an alternate diversion outcome. Current PC 1000 uses a not-guilty plea; that account is historical, and no similar criminal or immigration result is promised.

"They found heroin in a car I had borrowed. I genuinely had no idea it was there. David built the knowledge defense, showed the jury I didn't know the heroin existed, and I was acquitted. It was the most stressful thing I have ever been through and I am grateful for the rest of my life." — Anonymous former client

FREQUENTLY ASKED QUESTIONS

What is HS § 11350 — and what controlled substances does it cover?

HS § 11350 is California's primary possession statute for Schedule I and II controlled substances without a valid prescription. Covered substances include cocaine and cocaine base (crack), heroin and other opiates, codeine and morphine without a valid prescription, peyote, GHB, and other Schedule I and II controlled substances. Methamphetamine is charged under HS § 11377. Marijuana is charged under HS § 11357. The specific substance determines the specific defense strategy — because different substances carry different diversion eligibility, different immigration classifications, and different knowledge and possession challenges.

Is HS § 11350 a misdemeanor or a felony?

Following Proposition 47 (2014), HS § 11350 is a misdemeanor for most defendants — up to 1 year in county jail. It remains a felony for defendants with certain prior convictions specified in the statute, including serious felonies listed in PC § 667(e)(2)(C)(iv) and prior sex offender registration requirements under PC § 290. An incorrect felony charge based on a mischaracterized prior conviction is challenged directly — and correcting an improper felony charge eliminates state prison exposure and all additional felony collateral consequences.

Can I get diversion for an HS § 11350 charge?

Yes. A § 11350 possession charge is among the offenses listed in Penal Code § 1000, but the charge and person must satisfy the current criteria. PC 1000 begins with a not-guilty plea; dismissal follows satisfactory completion, a positive recommendation and a proper motion. Other diversion statutes may be considered if their separate requirements apply.

What are the immigration consequences of an HS § 11350 conviction?

A § 11350 conviction can carry serious immigration consequences, but it is not categorically a crime involving moral turpitude and does not make deportation automatic. Individual criminal and immigration advice is essential before a plea.

Can the evidence be suppressed?

A successful suppression motion can substantially weaken a § 11350 prosecution. Whether the charge is dismissed depends on the remaining evidence and court proceedings.

What if I didn't know the substance was there?

Lack of knowledge is a complete defense to HS § 11350 — the prosecution must prove you knew the controlled substance was present and knew what it was, beyond a reasonable doubt. A defendant who did not know the substance existed — in a borrowed vehicle, in someone else's bag, in a shared residence — did not commit possession under California law. The knowledge defense is developed through evidence of the circumstances of the discovery, others' access to the location, and every available fact consistent with genuine lack of awareness.

How long does PC 1000 diversion take?

Typically 12 to 18 months from enrollment to completion — including drug education classes, periodic check-ins, and drug testing. After successful completion, the petition for dismissal is filed and the dismissal typically enters within a few weeks. The full process from initial plea to final dismissal generally takes 12 to 24 months depending on the county and program.

Are payment plans available?

Yes. The Law Offices of David Chesley offers flexible payment plans because cost should never be the reason someone charged with HS § 11350 goes without experienced legal representation to pursue the defense their case deserves. Call to discuss options during your free consultation.

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FREE CONSULTATION — CALL NOW — 24/7

Before entering a plea, ask counsel to evaluate the evidence, current PC 1000 criteria and any other lawful diversion route. Dismissal is conditional, not assured, and immigration or licensing collateral consequences need individual review.

The Law Offices of David Chesley offer a free, confidential consultation available 24 hours a day, 7 days a week. No judgment. No pressure. Clear guidance tailored to your specific facts — including diversion eligibility, suppression analysis, immigration risks, and licensing consequences.

Flexible payment plans available — because cost should never be the reason someone charged with HS § 11350 goes without the experienced defense this charge demands.

David Chesley handles HS § 11350 defense in criminal courts across all of California — Los Angeles County, Orange County, San Diego County, Riverside County, San Bernardino County, Ventura County, Santa Barbara County, Kern County, Fresno County, Sacramento County, Alameda County, Santa Clara County, San Francisco County, Contra Costa County, San Joaquin County, Stanislaus County, Monterey County, and every other jurisdiction statewide.

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"HS § 11350 charges are serious, but they are highly defensible. Diversion, suppression, or element challenges often produce a clean dismissal. My commitment is pursuing every available defense from day one so you avoid a conviction that could follow you for life." — David Chesley, California Criminal Defense Attorney