Missouri Drug Threshold Amounts

Quick reference for Missouri trafficking thresholds

Two statutes carry the thresholds. The first-degree statute covers the distribution side, meaning distribute, deliver, manufacture, or produce. The second-degree statute covers the possession side, meaning possess, control, purchase, or bring into the state. The weights are the same. What separates them is what you were doing with the drug.

Substance	Base trafficking threshold
Heroin	More than 30 grams of mixture RSMo 579.065
Cocaine mixture	More than 150 grams of mixture RSMo 579.065
LSD	More than 500 milligrams RSMo 579.065
PCP	More than 30 grams mixture, or more than 4 grams pure RSMo 579.065
Marijuana	More than 30 kilograms of mixture RSMo 579.065
Amphetamine or methamphetamine	More than 30 grams RSMo 579.065
MDMA (ecstasy)	More than 30 grams RSMo 579.065
Fentanyl	More than 3 milligrams RSMo 579.065
Carfentanil	Any amount RSMo 579.065
Flunitrazepam	1 gram or more, first offense RSMo 579.065
GHB	Any amount, first offense RSMo 579.065

Notice the scale. Marijuana measures in kilograms. Fentanyl measures in milligrams. Carfentanil triggers at any detectable amount at all. RSMo 579.068

Where the trafficking line sits under Missouri law

Trafficking in Missouri is defined entirely by quantity and conduct, not by any commercial arrangement. Two statutes do the work. RSMo 579.065 RSMo 579.068

> A person commits the offense of trafficking drugs in the first degree if… such person knowingly distributes, delivers, manufactures, produces or attempts to distribute, deliver, manufacture or produce: (1) More than thirty grams of a mixture or substance containing a detectable amount of heroin; … (11) More than three milligrams of fentanyl… (12) Any amount of carfentanil.

The distribution-side statute reaches anyone who delivers, manufactures, produces, or attempts to. RSMo 579.065 The possession-side statute reaches anyone who possesses, controls, purchases, or brings a qualifying weight into Missouri. RSMo 579.068

Two terms carry the rest. “Delivery” means an actual, constructive, or attempted transfer between people, sale or no sale. “Possessed” means knowing the presence and nature of the substance and having actual or constructive control over it. RSMo 195.010

That second definition matters more than people expect. You do not have to hold the drug to possess it under Missouri law. Knowledge plus control is enough. That is how a person in a shared apartment or a borrowed car ends up charged.

What the State has to prove

To convict at trafficking weight, the prosecutor must prove every element beyond a reasonable doubt. The pattern instruction for first-degree trafficking is MAI-CR 4th 425.10. RSMo 579.065

A qualifying quantity of a controlled substance. This is the threshold element, and it is the one most cases turn on. The State must prove the weight met or exceeded the statutory floor for the specific drug charged. At the margin, that means the lab’s number is the case. A gram either way can move heroin from possession to trafficking, or from one felony tier to the next.

The prohibited conduct. For first-degree trafficking, the State must prove distribution, delivery, manufacture, production, or an attempt. For second-degree, it must prove possession, control, purchase, an attempt to purchase, or bringing the drug into the state. The weight can be identical; the conduct is what sorts the charge into first or second degree. RSMo 579.068

Knowledge that the substance was a controlled substance. The State must prove you knew, or were aware, that what you had was or contained a controlled substance. This is not a formality. With milligram-scale drugs like fentanyl and carfentanil, whether a person actually knew what the powder was becomes a live question, not an assumption.

Miss any one of these and the trafficking charge does not stand. Each element is a place where the case can come apart.

How the weight moves the charge up a tier

The threshold does two jobs. First it separates trafficking from ordinary possession or delivery. Then it separates the lower trafficking tier from the higher one. More weight means a more serious classification, all within the same statute. RSMo 579.065

On the distribution side, the base weights sit at the lower felony tier and the elevated weights push it higher. RSMo 579.065

Substance	Elevated threshold
Heroin	90 grams or more RSMo 579.065
Cocaine mixture	450 grams or more RSMo 579.065
LSD	1 gram or more RSMo 579.065
PCP	90 grams or more, or 12 grams or more pure RSMo 579.065
Marijuana	100 kilograms or more RSMo 579.065
Amphetamine or methamphetamine	90 grams or more RSMo 579.065
MDMA	90 grams or more RSMo 579.065
Fentanyl	14 milligrams or more RSMo 579.065
Carfentanil	More than 0.05 milligrams RSMo 579.065

Weight is not the only elevator. For amphetamine, methamphetamine, or MDMA, more than 30 grams within 2,000 feet of a school, college, school bus, public or assisted housing, a motor vehicle, or a lodging establishment moves the offense to the higher tier by location alone. RSMo 579.065

The possession-side statute grades the same way. It starts at a lower felony class at the base weights, steps up at the elevated weights, and reaches its most serious class at 450 grams or more of the amphetamine, methamphetamine, or MDMA groups. RSMo 579.068

What trafficking weight actually carries

Missouri classifies both trafficking offenses as felonies, and the class rises with the weight. The consequence is prison, and the range depends entirely on which tier the weight lands in. RSMo 579.065

First-degree trafficking is a Class B felony at the base thresholds and a Class A felony once an elevated quantity or a protected-location condition applies. RSMo 579.065

Second-degree trafficking is a Class C felony at the base thresholds, a Class B felony at the elevated quantities, and a Class A felony at 450 grams or more of the amphetamine, methamphetamine, or MDMA groups. Flunitrazepam under one gram is a Class C felony on a first offense and a Class B felony on any second or later offense. RSMo 579.068

Class	Prison range
Class A felony	Ten to thirty years, or life RSMo 579.068
Class B felony	Five to fifteen years RSMo 579.068
Class C felony	Three to ten years, fine up to ten thousand dollars RSMo 579.068

Both trafficking offenses are subject to the prior, persistent, and dangerous offender regime, which can extend a sentence based on criminal history. Missouri has no three-strikes law; sentencing history is handled through that offender framework instead. RSMo 579.065

One consequence sits below the threshold entirely. If the weight is disputed and the State cannot clear the trafficking floor, the same conduct drops to possession or delivery, both of which carry substantially lower classifications. Possession of a controlled substance below the marijuana tiers is a Class D felony. Delivery below trafficking weight is generally a Class C felony. RSMo 579.015 RSMo 579.020

The mixture rule, and why it decides trafficking cases

Here is the concept that surprises people most and matters most. Missouri counts the weight of the whole mixture, not the pure drug. RSMo 195.010

The statutes describe a “mixture or substance containing a detectable amount” of the drug. That phrase is doing enormous work. If a small quantity of a controlled substance is cut into a much larger inert mass, the entire mass counts toward the threshold. A defendant can hit a trafficking weight while the actual drug present is a fraction of what the scale reads. RSMo 579.065

The exception is the pure-PCP tier, where the statute sets a separate weight for the pure drug. RSMo 579.065 For everything else, the mixture controls.

This is why the lab report is often the whole case at the margin. What went on the scale, how it was weighed, whether packaging or filler was properly excluded, whether separate packages were combined into a single number, all of it feeds directly into whether the threshold was crossed. When the difference between possession and trafficking is a few grams, the composition of that weight is not a technicality. It is the case.

How a threshold case gets defended

The threshold framework creates its own defense openings, because the whole prosecution rests on a number, and numbers can be contested. RSMo 579.065

Challenge the lab weight and testing. Because the mixture weight controls, the laboratory measurement is often outcome-determinative right at the threshold margin. Scale calibration, testing methodology, and whether the full mass actually qualified as a “mixture” under the statute are all open to challenge. A few grams recovered can drop the charge below trafficking.

Contest how the weight was aggregated. Prosecutors sometimes combine the weight of separate packages or separate transactions to clear a threshold. Whether those amounts belong in a single charge is a real question. If the packages should not be combined, no single quantity may reach the line. RSMo 579.068

Dispute the mixture composition. The “detectable amount” rule counts qualifying mixture, not everything on the table. Packaging, inert filler outside the statutory mixture, and non-drug material that was swept into the weight can be argued out of the total.

Attack knowledge. The State must prove you knew the substance was or contained a controlled substance. At milligram scale, that is genuinely contestable. A person can possess a powder without knowing it contained fentanyl or carfentanil, and knowledge is an element the State cannot skip.

Challenge constructive possession. On the possession side, proximity is not enough. The State must prove knowledge of the drug’s presence and nature plus control over it. When drugs turn up in a shared home or a vehicle with more than one occupant, that link is often where the case is weakest. RSMo 195.010 RSMo 579.068

Suppress the search, or break the chain of custody. If the stop or search violated the Fourth Amendment, the substance may be suppressed, and with it the weight evidence disappears. A gap in the chain of custody undermines the foundation for the tested weight the whole charge depends on.

Negotiate below the threshold. When the weight is genuinely disputed at the margin, the practical goal is often resolution as possession or delivery below the trafficking floor. That is the core of a threshold defense, and it turns entirely on where the number actually lands. RSMo 579.015 RSMo 579.020

For marijuana quantities, one more layer applies. Missouri’s adult-use cannabis amendment changed how certain marijuana amounts are treated, and whether a given quantity even reaches a threshold has to be confirmed against those legal limits before the older weight tiers apply at all.

Why the number needs someone who works these cases

A Missouri trafficking charge is built on a weight, and a weight is provable, contestable, and frequently wrong at the margin. We defend drug cases where the difference between a trafficking felony and simple possession comes down to a few grams on a lab report, and we know how to press the measurement, the aggregation, the mixture composition, and the knowledge element the State would rather treat as settled. Felony drug matters in the St. Louis area are handled in the circuit court, and early work on the seized evidence is where threshold cases are often won or lost. If you are facing a Missouri drug charge and the quantity is anywhere near a threshold, the weight is worth challenging before the State locks in its number.

Talk to a defense lawyer about the weight in your case

The threshold is the line, and where your quantity lands on it decides what you are facing. If the amount in your case is near a trafficking cutoff, that number deserves a hard look before anything is assumed.

Contact our defense team for a case evaluation.

Common questions about Missouri drug thresholds

Does trafficking mean I sold drugs?

No. In Missouri, trafficking is defined by weight and conduct, not by any sale. Possessing a qualifying quantity is enough to be charged with second-degree trafficking, even if nothing was sold. RSMo 579.068

Is the whole bag weighed, or just the drug?

The whole mixture is weighed. Missouri counts the total weight of any mixture containing a detectable amount of the drug, not the pure drug alone. The pure-PCP tier is the one exception. RSMo 195.010 RSMo 579.065

Why is the fentanyl threshold so small?

Fentanyl thresholds are set in milligrams because the drug is potent at tiny quantities. More than three milligrams reaches the base trafficking level, and carfentanil triggers at any amount at all. That is far below the gram-scale weights for most other drugs. RSMo 579.065

What if the weight is just barely over the line?

That is exactly where threshold defense lives. A disputed measurement at the margin can move a charge from trafficking down to possession or delivery, which carry substantially lower classifications. RSMo 579.015 RSMo 579.020

References

1. RSMo 579.065 — Trafficking Drugs in the First Degree. Elements checked against MAI-CR 4th 425.10.

2. RSMo 579.068 — Trafficking Drugs in the Second Degree.

3. RSMo 195.010 — Definitions (controlled substance, delivery, possession, mixture/detectable amount) for the drug-offense statutes.

4. RSMo 579.015 — Possession of a Controlled Substance. Elements checked against MAI-CR 4th 425.02.

5. RSMo 579.020 — Delivery of a Controlled Substance.