Under The Influence Of A Controlled Substance

It is illegal to be under the influence of a controlled substance pursuant to California’s Health and Safety Code 115501.

Below I explain the defenses and penalties of HS 11550.

Overview Of Health & Safety Code 11550

For someone to be found guilty of HS 11550 the prosecutor must prove the following elements.

  • You willfully2 used a controlled substance or narcotic drug,
  • And/or you were under its influence3

What Is Considered Using A Controlled Substance?

To be considered “using,” your use must be current or immediately before your arrest, though this is a legal phrase that is open to interpretation and dependent on the facts and circumstances of your case4.

Person on Drugs

If you are caught in possession of a controlled substance or prescription drug that is not your own, then you may be arrested for possession and use if there is probable cause to test you for being under the influence.

What Is Considered Being Under The Influence?

Peace or law enforcement officers are trained to some degree to detect certain drug use in individuals.

You need only be exhibiting some signs of drug use to be subject to arrest. This is a lesser standard than for being under the influence of a drug.

You need not appear or act impaired, at least to a certain degree, to be convicted under this code section. You also could face DUI charges as well as a violation of HS 11550 if you used a narcotic that impaired your ability to drive.

Can You Be Arrested For Prescription Drugs Under This Code Section?

Use of or being under the influence of a drug includes the use of a prescription drug that can also subject you to prosecution under this law if you obtained it illegally or were impaired or under the influence while driving.

Which Controlled Substances Can You Be Arrested For Under H&S 11550?

Controlled substances are listed by statute in the state’s Health and Safety Code 11054-11058.

These are classes of drugs based on their risk to health and lack of any medical or medicinal value or use and its potential for abuse and dependence.

The schedules of controlled substances contain the following commonly used drugs in order of their determined potential for abuse and harm with a few examples of each5:

Schedule IHeroinCrackPCP
Schedule IIMorphineVicodinRitalin
Schedule IIINandroloneTestosteroneButabarbital
Schedule IVAmbianAtivanAnti-Anxiety Medications

Penalties & Sentencing

Violation of HS 11550 is a misdemeanor unless there are aggravating factors such as firearm possession or a 3rd offense with refusal to participate in a drug treatment program:

Drug Counseling & Community ServiceYesAs the court determines
ProbationUp to 5 years of probationFormal Probation
JailUp to 1 year in county jailUp to 2,3, or 4 years in state prison

How Does A Prior Conviction Or Refusal To Participate In A Program Affect The Penalty?

A second conviction carries similar penalties but the third one within 7 years coupled with a refusal to participate in or noncompliance with a drug treatment program will result in a mandatory minimum jail sentence of 180 days6.

mandatory minimum sentence

How Does Firearm Possession Affect The Penalty?

If you are in possession of a firearm while using or being under the influence of a controlled substance, your offense is a “wobbler,” or one in which the DA can charge you with either a misdemeanor or a felony.

It is a straight felony if you are found to be addicted to a controlled substance while in possession of a firearm, whether you have a valid permit or not.

If charged as a felony, you face 2 to 4 years in either county jail or state prison. Any felony conviction results in a lifetime ban from owning or possessing a firearm7.

What Alternatives To Incarceration And To Conviction Exist?

A Deferred Entry of Judgement or Penal Code 1000

Possession of a controlled substance or being under the influence is a non-violent offense.

Accordingly, you are given an alternative to incarceration and to a criminal conviction under California Proposition 36 and Penal Code 1000 that offers deferred judgment or diversion.

You are not eligible if you possessed the drugs for sale or were engaged in a violent act.

Other criteria include:

Under PC 1000, you will have to enter a plea of guilty but the judge will defer further proceedings for up to 3 years while you complete approved drug treatment.

During the course of your treatment, you will be monitored and a progress report submitted to the court.

Progress Report

If you are successful in completing the treatment and commit no further offenses and pass all drug tests, the court will dismiss the charges.

What Is Proposition 36?

Proposition 36 is also a deferred judgment alternative available for those with a violent or otherwise serious felony.

You still, however, must not have committed any of the conditions outlined above.

You still plead guilty to the underlying charge and the court will defer further proceedings except that you are under formal probation and any conditions imposed. Even if you satisfy all conditions, the court may still decide to not dismiss the charges though you will likely not spend any time in jail or prison.

Can I Go To Drug Court?

Another program is participation in a California drug court.

Your eligibility is similar to that for diversion and deferred entry of judgment. The counties where the drug courts operate have more flexibility and have their own programs in which you are required to participate.

This may include counseling, attendance in school, actively looking for and maintaining employment, meeting with your probation officer on a regular basis, and submitting to random drug testing. Upon completion, your charges are dismissed.

Legal Defenses

Some defenses that experienced criminal defense attorneys use in these cases are as follows:

There Is A Lack Of Proof Of Being Under The Influence

To be convicted under this code section, you will typically have to be tested by a blood or urine test.

The officer who asks you to be tested must have probable cause to believe you are under the influence such as by exhibiting certain behavior.

This might include acting irrationally or erratically, be passed out, or experiencing hallucinations.

Absent a drug test, symptoms that mimic drug use are just as likely to be attributable to fatigue, dehydration, or conditions of some other illness or condition unrelated to any drug use.

You Have Valid Possession of a Prescription Drug

Having a valid prescription is a defense so long as it is in your name and you did not take a dose that exceeds the prescription8.

If you forged the prescription or possess multiple prescriptions of the same drug, you have committed a separate offense.

Under What Conditions Can You be Tested?

There are certain conditions under which you may be requested, or even forced, to submit to drug testing.

For instance, if you are involved in a fatal car accident, a police officer will ask you to submit to drug testing so long as there is probable cause to believe you were under the influence.

Police can no longer force you to submit to a blood test unless you are suspected of committing a felony and the police obtain a warrant unless there are exigent circumstances where there is no time to obtain one.

If, however, you are a minor or under probation where a provision states that a law enforcement officer may request that you undergo drug testing and you refuse, you may be subject to a probation violation and possible incarceration or detention if a minor.


You can seek post-conviction relief in most instances if you were convicted under Health and Safety Code 11550.

California law allows expungement of a conviction so long you did not serve time in state prison, which will cause you to be ineligible for expungement relief.

An expungement allows you certain benefits, including having your conviction shielded from public viewing or access should anyone from the general public conduct a criminal background of you.

Since state prison time disqualifies you, it is vital that your criminal defense attorney work to have you sentenced to county jail if you are convicted of a wobbler offense if the court feels that incarceration in your case warrants it, such as being under the influence of a controlled substance while in possession of a firearm.

  • Find Out if You Are Eligible To Have Your Record Expunged
  • Stop Worrying About Employer Background Checks
  • Stop Worrying About Landlord Background Checks

Eligibility for Expungement

As indicated herein, if you were convicted of a misdemeanor under Health and Safety Code 11550 or a felony for which you served no state prison time, you qualify for an expungement of the conviction. You may petition the court once you satisfy these other conditions:

  • all conditions of your sentence and probation have been completed
  • You have not committed a subsequent felony
  • No criminal charge are pending
  • You committed no violation of your probation
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  1. Elements. Health & Safety. Code, § 11550. []
  2. Someone commits an act willfully when he or she does it willingly or on purpose; Willfully Defined. Pen. Code, § 7(1); People v. Lara (1996) 44 Cal.App.4th 102, 107 [51 Cal.Rptr.2d 402] []
  3. “Someone is under the influence of a controlled substance if that person has taken or used a controlled substance that has appreciably affected the person’s nervous system, brain, or muscles or has created in the person a detectable abnormal mental or physical condition Under the Influence” [CALCRIM 2400]. People v. Culberson (1956) 140 Cal.App.2d Supp. 959, 960–961 [295 P.2d 598]; see also People v. Canty (2004) 32 Cal.4th 1266, 1278 [14 Cal.Rptr.3d 1, 90 P.3d 1168]; People v. Enriquez (1996) 42 Cal.App.4th >661, 665 [49 Cal.Rptr.2d 710]. []
  4. Requires Current Use. People v. Jones (1987) 189 Cal.App.3d 398, 403–404 [234 Cal.Rptr. 408]; see also People v. Velasquez (1976) 54 Cal.App.3d 695, 699–700 [126 Cal.Rptr. 656]; People v. Gutierrez (1977) 72 Cal.App.3d 397, 402 [140 Cal.Rptr. 122] []
  5. See Also – Controlled Substances List – Drug Enforcement Administration []
  6. Health & Safety Code 11550 (b)(1) – A person who is convicted of violating subdivision (a) when the offense occurred within seven years of that person being convicted of two or more separate violations of that subdivision, and refuses to complete a licensed drug rehabilitation program offered by the court pursuant to subdivision (c), shall be punished by imprisonment in a county jail for not less than 180 days nor more than one year. In no event does the court have the power to absolve a person convicted of a violation of subdivision (a) who is punishable under this subdivision from the obligation of spending at least 180 days in confinement in a county jail unless there are no licensed drug rehabilitation programs reasonably available. []
  7. Heath & Safety Cide 11550(f)  – Every person who violates subdivision (e) is punishable upon the second and each subsequent conviction by imprisonment in the state prison for two, three, or four years. []
  8. “The prescription defense is codified in Health and Safety Code section 11550. The defendant need only raise a reasonable doubt about whether his or her use of the drug was lawful because of a valid prescription.” [CALCRIM 2400] (See People v. Mower (2002) 28Cal.4th 457, 479 [122 Cal.Rptr.2d 326, 49 P.3d 1067].) If there is sufficient evidence, the court has a sua sponte duty to instruct on the defense []

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