What Does 720 ILCS 570/402(c) Mean in Illinois?

A charge under 720 ILCS 570/402(c) is simple possession of a controlled substance in Illinois — the catch-all subsection of the Controlled Substances Act that covers holding illegal drugs in amounts below the state’s quantity-based felony tiers. It is a Class 4 felony punishable by one to three years in prison and a fine of up to $25,000.¹² The most important thing to know if you have been charged: if this is your first felony drug offense, a separate provision of the same Act — Section 410 — can put you on probation without entering a conviction, and dismiss the case entirely once you finish it.³

What 402(c) Covers

Section 402 makes it illegal to knowingly possess a controlled substance without a valid prescription or other legal authorization. The statute is divided by drug type and weight. Subsection (a) covers larger quantities of specific named substances — 15 grams or more of heroin, cocaine, morphine, or LSD, among others — and charges those as Class 1 felonies. Subsection (d) handles methamphetamine separately.²

Subsection (c) picks up everything else. It applies to smaller amounts of the named drugs (under 15 grams of cocaine or heroin, for example) and to any amount of substances in Schedules I through V that are not specifically listed in subsections (a) or (d). Prescription opioids possessed without a prescription, certain hallucinogens, and newer synthetic drugs all typically fall under 402(c). If you were caught with a small amount of almost any illegal drug in Illinois, this is likely the statute on your charging document.²

One boundary matters: Section 402 covers possession only. If police believe you intended to sell or distribute, they will charge under Section 401 (manufacture or delivery), and the penalties climb quickly, potentially into Class X felony territory with a six-year minimum, no probation available, and a maximum of 30 years or more.⁴

The Class 4 Felony Penalty Range

Class 4 is the lowest felony classification Illinois has. The base imprisonment range is one to three years, with an extended term of three to six years available in cases involving aggravating circumstances.¹ The maximum fine under 402 is $25,000.²

“Lowest felony” is still a felony. A conviction goes on your permanent criminal record, strips your right to own firearms under both state and federal law, and creates lasting problems with employment, housing, and professional licensing. The short prison range does not describe the full weight of the outcome.

Section 410 First-Offender Probation

This is the piece of a 402(c) case that changes everything, and the piece most people charged under it do not know exists. Section 410 of the Controlled Substances Act creates a special probation pathway specifically for defendants charged under subsection (c) who have no prior felony drug convictions under Illinois law, another state’s law, or federal law.³

If you qualify, the court can place you on 24 months of probation without entering a conviction. The standard conditions include:

Staying out of any new legal trouble
Submitting to drug testing at least three times during the probation period
Performing a minimum of 30 hours of community service
Not possessing firearms

The court may add drug treatment, employment, or education requirements on top of those.³

Complete every condition and the court dismisses the case. No felony conviction is entered, no prison time is imposed, and the arrest itself becomes eligible for expungement — though you have to wait five years after probation ends before filing that petition.⁵ Violate the probation terms and the court can enter the conviction and sentence you within the normal Class 4 range.

Section 410 is discretionary. Even eligible defendants do not always get it, and prosecutors may push back. This is the outcome to focus on, and the reason competent representation on a 402(c) case pays for itself.

How a Prior Conviction Changes the Math

Section 408 of the Act doubles the exposure for anyone with a prior drug conviction. If you have previously been convicted under the Illinois Controlled Substances Act or any state or federal controlled substance law, a second or subsequent offense can be punished with up to twice the maximum prison term and twice the maximum fine that would otherwise apply.⁶

For a 402(c) charge that means up to six years in prison instead of three, and up to $50,000 in fines instead of $25,000. A prior also removes you from Section 410 first-offender probation, which closes the path to dismissal.³

Two Common Misconceptions

Drug-free zone enhancements do not apply to simple possession. Section 407 raises penalties for drug offenses within 500 feet of schools, public parks, houses of worship, and senior care facilities, but it targets delivery and manufacturing offenses under Section 401, not possession under Section 402.⁷ Location still matters indirectly: prosecutors may treat possession near a protected area as circumstantial evidence of intent to distribute and charge under Section 401 instead, at which point the zone enhancements do apply.

Cannabis is handled elsewhere. Adults 21 and older can legally possess up to 30 grams of cannabis flower, 500 milligrams of THC in infused products, and 5 grams of cannabis concentrate; non-residents have lower limits.⁸ Cannabis charges above those thresholds are prosecuted under the Cannabis Control Act, not 402(c). Every other controlled substance — cocaine, heroin, fentanyl, prescription opioids, synthetic drugs — remains squarely within 402.

Fighting the Case: The Suppression Motion

In drug possession cases the fight usually happens before trial, in a motion to suppress evidence. The Fourth Amendment prohibits unreasonable searches, and if police obtained the drugs through an illegal search, the evidence can be thrown out. Without the drugs, the prosecution generally has no case.

Common grounds for suppression include searches conducted without a warrant or probable cause, traffic stops extended beyond their lawful purpose to wait for a drug dog, and searches based on nothing more than nervousness or a prior record. Legitimate probable cause in a vehicle stop can come from drugs or paraphernalia in plain view, the odor of illegal substances, statements from occupants, or an alert from a drug-detection dog during a lawful stop. You are never required to consent to a search, and refusing consent does not by itself give officers grounds to search.

When the evidence holds up and Section 410 probation is on the table, plea negotiations become the practical path. Prosecutors will often agree to recommend probation in exchange for a guilty plea, and the specifics vary with the strength of the case, your record, and local State’s Attorney practices.

Clearing the Record Afterward

What you can do to clear the record depends entirely on how the case ended.

If you completed Section 410 probation and the case was dismissed, the arrest qualifies for full expungement. Illinois classifies Section 410 probation as “qualified probation,” and you can petition for expungement five years after successfully finishing probation.⁵ Expungement destroys the record — the closest Illinois gets to erasing the arrest.

If the case ended in acquittal or was dismissed outright without going through Section 410, expungement is also available, typically with a shorter wait.

If a conviction was entered, whether by plea or trial, expungement is generally not available. Sealing is the alternative: it hides the record from most public background checks without destroying it. Sealing requires a petition, and the judge weighs your rehabilitation, time since the offense, and any subsequent criminal history. Filing fees vary by county.

Consequences That Reach Beyond the Sentence

The prison range and fine are only part of what a 402(c) conviction does.

Firearms

Federal law prohibits anyone convicted of a crime punishable by more than one year from possessing firearms or ammunition, so a Class 4 felony conviction triggers the ban. Federal law separately bars anyone who is an “unlawful user of or addicted to” a controlled substance from possessing firearms, which can apply even without a conviction.⁹

Immigration

For non-citizens the stakes are much higher. A conviction for any offense relating to a controlled substance makes you deportable, with only one narrow exception: a single offense involving 30 grams or less of marijuana.¹⁰ A controlled substance conviction also makes you inadmissible, which can block re-entry, a green card, or naturalization.¹¹ Even a documented drug addiction without any conviction can trigger these consequences. If you are not a U.S. citizen, talk to an immigration attorney before accepting any plea.

Housing, Aid, and Work

A drug conviction can disqualify you from federally assisted housing. Housing authorities have wide discretion to deny applicants based on drug-related history, and certain triggers, such as eviction from public housing for drug activity within the last three years or current illegal drug use, require denial. Federal financial aid is less of a barrier than it once was — the FAFSA no longer asks about drug convictions, so Pell Grants and federal student loans are not automatically off-limits — but private scholarships and some state programs still screen for criminal records. Professional licensing bodies (nursing, teaching, and many others) routinely investigate drug convictions and can impose monitoring or deny a license outright. This is another argument for pushing hard on Section 410 probation: with no conviction entered, the biggest barrier to employment and licensing never appears.

1
Illinois General Assembly. 730 ILCS 5/5-4.5-45 – Class 4 Felonies Sentence
2
Illinois General Assembly. 720 ILCS 570/402
3
Illinois General Assembly. 720 ILCS 570/410
4
Illinois General Assembly. 730 ILCS 5/5-4.5-25 – Class X Felonies Sentence
5
Illinois General Assembly. 20 ILCS 2630/5.2
6
FindLaw. Illinois Code 720 570/408
7
Illinois General Assembly. 720 ILCS 570/407
8
FindLaw. Illinois Code 410 705/10-10
9
Office of the Law Revision Counsel. 18 USC 922
10
Office of the Law Revision Counsel. 8 USC 1227 – Deportable Aliens
11
Office of the Law Revision Counsel. 8 USC 1182 – Inadmissible Aliens