Missouri Armed Criminal Action Defense Attorney

Quick Reference: Armed Criminal Action Under §571.015

What the Law Actually Says

Section 571.015 provides that any person who commits a felony while armed with a “deadly weapon or dangerous instrument” is guilty of Armed Criminal Action in addition to the underlying felony.

“Deadly Weapon” and “Dangerous Instrument”

Missouri law defines these terms broadly:

Deadly weapon includes any firearm, knife, sword, or other bladed weapon — regardless of whether it is loaded, sharpened, or operable. An unloaded firearm is still a deadly weapon under the statute.

Dangerous instrument includes any object that is “readily capable of causing death or serious physical injury” when used as a weapon. Missouri courts have interpreted this definition expansively. Objects that have qualified as “dangerous instruments” in Missouri case law include baseball bats, vehicles (when used to ram or strike), tools (hammers, crowbars), bottles, and other everyday objects when used or threatened to be used in a manner capable of causing death or serious physical injury.

The breadth of the “dangerous instrument” definition means ACA is not limited to gun cases. Any felony committed while the defendant has access to an object that could cause serious harm — when that object is connected to the felony conduct — can trigger the enhancement.

“Armed With” During the Commission of a Felony

The connection between the weapon and the felony is critical. “Armed with” requires more than mere possession of a weapon at some unrelated point in time — the weapon must have been available to and connected with the felony. A firearm stored in a locked safe in a separate room during a drug transaction may not satisfy the “armed during commission” element. A firearm on the defendant’s hip during the same transaction clearly does.

The question of how close the connection must be — how proximate the weapon must be to the criminal conduct — is litigated frequently in Missouri courts. Defense attorneys challenge the nexus between the weapon and the felony when the connection is attenuated.

ACA Applies to ANY Felony

A critical point that many defendants do not understand: ACA is not limited to violent felonies. It can be charged alongside any felony — drug trafficking, burglary, stealing, forgery, or any other offense — when a weapon is involved. A defendant who commits felony drug distribution while carrying a firearm faces ACA. A defendant who commits felony stealing while armed with a knife faces ACA. The felony does not need to be violent for the enhancement to apply.

Elements the Prosecution Must Prove

1. The defendant committed a felony. The underlying felony must be proven independently — ACA is an enhancement, not a standalone offense. If the defendant is acquitted of the underlying felony, the ACA charge falls automatically.
2. During the commission of the felony, the defendant was armed with a deadly weapon or dangerous instrument. The weapon must have been available and connected to the felony. “During the commission of” includes the attempt, the completion, and the immediate flight from the offense.
3. The instrument qualifies as a “deadly weapon” or “dangerous instrument” under Missouri law. For firearms, this element is straightforward. For other objects, the State must prove the object was “readily capable” of causing death or serious physical injury in the manner it was used, threatened to be used, or available to be used.

The State does not need to prove that the weapon was actually used, fired, or brandished — only that the defendant was “armed with” it during the commission of the felony. The distinction between being armed and using a weapon matters in some cases: a defendant who carries a concealed firearm during a drug transaction is “armed” even if the firearm is never displayed, mentioned, or used to threaten anyone.

Classification and Penalties

Cumulative Exposure Examples

The consecutive and mandatory nature of ACA means it dramatically increases total sentencing exposure in every case where it is charged:

Drug trafficking + ACA (first offense): Trafficking Class B (5–15 years, 85% minimum) plus ACA (3–15 years, 85% minimum, consecutive). Minimum total exposure: 8 years. Maximum: 30 years. Minimum time served before parole: approximately 6 years 10 months.

Robbery 1st + ACA (first offense): Robbery Class A (10–30 years or life, 85% minimum) plus ACA (3–15 years consecutive, 85% minimum). Minimum total exposure: 13 years. Maximum: 45 years or life. Minimum time served: approximately 11 years.

Assault 1st + ACA (first offense): Assault Class B (5–15 years, 85% minimum) plus ACA (3–15 years consecutive, 85% minimum). Same range as drug trafficking. Minimum time served: approximately 6 years 10 months.

Any felony + ACA (second offense): The ACA portion alone carries 5–30 years consecutive. Combined with the underlying felony, total exposure can easily reach 40+ years.

These numbers illustrate why ACA dismissal in plea negotiations is the single most impactful outcome a defense attorney can achieve in many cases.

Defense Strategies That Work in ACA Cases

Defeat the Underlying Felony

ACA cannot survive without a conviction on the underlying felony. It is an enhancement — not an independent offense. If the defense wins an acquittal or dismissal on the underlying charge, the ACA enhancement falls automatically. Every resource invested in defeating the underlying felony pays double dividends — eliminating both the base charge and the ACA enhancement.

Challenge the “Armed” Element

The weapon must have been connected to the felony — not merely present somewhere in the defendant’s life. Defense attorneys challenge the nexus between the weapon and the criminal conduct:

Was the weapon on the defendant’s person during the offense, or in a different location? Was the weapon accessible during the commission of the felony, or locked away? Was the weapon used, displayed, or referenced during the offense — or was it unrelated to the criminal conduct? Did the defendant know the weapon was present, or was it placed there by someone else?

A firearm found in a locked safe in a bedroom during a drug offense that occurred in the living room may not satisfy the “armed during the commission of” element. A firearm in a separate vehicle parked blocks away may not be sufficiently connected. The closer the State must stretch to connect the weapon to the felony, the weaker the ACA charge becomes.

Challenge “Dangerous Instrument” Classification

When the State alleges a non-firearm object as the dangerous instrument — a baseball bat, a vehicle, a tool — the defense can challenge whether the object actually qualifies. The State must prove the object was “readily capable of causing death or serious physical injury” in the manner it was used or threatened to be used. Not every object used during a felony meets this standard, and the State’s burden is to prove the specific object’s capability in the specific context of the offense.

Negotiate ACA Dismissal

In plea negotiations, ACA dismissal is almost always the highest-priority concession a defendant can obtain. Because ACA adds mandatory consecutive time with no probation eligibility and 85% mandatory minimum, dropping the ACA enhancement in exchange for a plea on the underlying felony can reduce total sentencing exposure by years or decades.

Experienced defense counsel approaches ACA negotiation strategically: identifying the weaknesses in the State’s ACA case (attenuated connection between weapon and felony, questionable “dangerous instrument” classification, or evidentiary gaps), using those weaknesses as leverage, and framing ACA dismissal as a reasonable resolution that serves the interests of both the prosecution and the defense.

Constitutional Challenges

The Eighth Amendment prohibition against cruel and unusual punishment provides a potential challenge when ACA sentences become grossly disproportionate to the underlying conduct. A defendant who commits a nonviolent felony — felony stealing, for example — while coincidentally carrying a concealed firearm that is never used, displayed, or referenced faces the same ACA enhancement as a defendant who commits armed robbery. When the ACA sentence dramatically exceeds the punishment warranted by the defendant’s actual conduct, as-applied proportionality challenges are available.

Suppression of the Weapon

If the weapon that forms the basis of the ACA charge was discovered through an unconstitutional search, suppressing the weapon eliminates the ACA enhancement even if the underlying felony survives on other evidence. This is particularly relevant in drug cases where drugs and firearms are discovered in the same search — if the search is suppressed, both the drugs (underlying felony evidence) and the firearm (ACA evidence) are excluded.

Collateral Consequences of ACA Convictions

ACA convictions are extremely difficult to overturn. Post-conviction relief for ACA sentences requires demonstrating that the enhancement was improperly applied — a high legal standard.

ACA convictions count toward subsequent offenses. A first ACA conviction means any future ACA charge is a second offense (5–30 years consecutive). A second conviction means any future charge is a third offense (10 years to life consecutive). The escalation is permanent and cumulative.

Expungement. ACA may be eligible for expungement only if the underlying offense is also eligible. If the underlying felony is excluded from expungement (trafficking, certain violent offenses, sex offenses), the ACA conviction is likewise excluded.

Rose Legal Services Fights ACA Enhancements in Every Case

Armed Criminal Action is the charge that turns manageable sentences into decades-long prison terms. Our firm treats ACA as a priority in every case where it is charged — challenging the enhancement directly, negotiating its dismissal when possible, and ensuring that the consecutive, no-probation, 85%-minimum consequences are fully understood and aggressively defended against. We handle ACA cases in St. Louis County, St. Charles County, Jefferson County, and throughout Missouri.

Call Rose Legal Services 24/7 for a free consultation. The defense starts with a conversation.

References

1. §571.015, RSMo [Armed Criminal Action — elements, sentencing ranges, consecutive requirement, no probation].
2. §556.061(19), RSMo [Dangerous felony designation — ACA included, 85% mandatory minimum].
3. U.S. Const. amend. VIII [Cruel and unusual punishment — proportionality challenges].
4. U.S. Const. amend. IV; Mo. Const. art. I, §15 [Search and seizure — suppression of weapon evidence].