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Kansas City Criminal Defense

Armed Criminal Action Defense Attorney

Armed Criminal Action is one of the most serious charges in Missouri — carrying a mandatory minimum prison sentence with no possibility of probation. If you or a loved one is facing this charge in Jackson, Clay, or Platte County, the time to act is now.

Book a Free Consultation Or call now — 816-451-0909

What Is Armed Criminal Action in Missouri?

Armed Criminal Action (ACA) under RSMo §571.015 is not a standalone crime — it is an additional charge that prosecutors stack on top of any felony when they allege that a deadly weapon or dangerous instrument was used in the commission of that felony. In practice, this means ACA almost always appears alongside another serious charge: assault, robbery, drug trafficking, homicide, or another violent offense.

What makes ACA uniquely dangerous is that it carries its own separate sentence that must run consecutively — meaning on top of, not at the same time as, the sentence for the underlying felony. A conviction on both the underlying charge and the ACA count can effectively double the prison time a defendant faces.

ACA is one of the most frequently filed charges in Jackson County and throughout the Kansas City metro. Prosecutors use it aggressively because it raises the stakes of any plea negotiation and gives them significant leverage. Having an attorney who understands how to challenge this charge — and how to negotiate around it — is not optional. It is essential.

What Must the Prosecutor Prove?

To convict on Armed Criminal Action, the State of Missouri must prove three elements beyond a reasonable doubt:

The Three Elements of ACA

  • Commission of a felony — The defendant committed, attempted, or aided in a qualifying felony offense.
  • Use of a deadly weapon or dangerous instrument — A deadly weapon or dangerous instrument was used in the commission of that felony. "Dangerous instrument" is defined broadly under Missouri law and can include objects not typically thought of as weapons.
  • Knowing use or assistance — The defendant knowingly used, assisted in using, or made the weapon available for use during the felony.

The critical word is "used." Missouri case law has wrestled extensively with what it means to "use" a weapon during a felony. Merely possessing a firearm during an unrelated act is not the same as using it in the commission of a crime — and that distinction has been the foundation of many successful defenses.

Penalties for Armed Criminal Action

The penalties for ACA are severe, and the sentencing structure is unusual compared to most Missouri felonies:

Sentencing Ranges

  • First offense: Minimum 3 years in the Missouri Department of Corrections. No statutory maximum — the sentence is left to the court's discretion. Probation is not available.
  • Second offense: Minimum 5 years. Again, no maximum. No probation.
  • Third or subsequent offense: Minimum 10 years. No maximum. No probation.
  • Consecutive sentencing required: The ACA sentence must be served after the sentence for the underlying felony — not concurrently. This is mandatory under RSMo §571.015.

To put this in concrete terms: if a defendant is convicted of First-Degree Assault (a Class A felony carrying 10–30 years) and Armed Criminal Action, the minimum combined exposure is 13 years in prison with no possibility of probation. This is why ACA is often the charge that drives plea negotiations and case strategy more than the underlying felony itself.

Common Defense Strategies

Every ACA case is different, and the right defense depends on the facts. That said, several categories of defense have proven effective in Missouri courts:

Challenging "Use" of the Weapon

If the weapon was present but not actively employed in the commission of the felony, the ACA charge may not be supported. Mere proximity or passive possession is not sufficient under Missouri case law. The State must show the weapon played a role in facilitating the crime.

Attacking the Underlying Felony

ACA cannot stand without a qualifying felony conviction. If the underlying charge is reduced to a misdemeanor or dismissed entirely — through suppression of evidence, witness credibility challenges, or constitutional violations — the ACA charge falls with it.

Suppression of Evidence

If the weapon was discovered through an unlawful search — without a valid warrant, without probable cause, or in violation of the Fourth Amendment — a motion to suppress can remove the weapon from the case entirely. Without the weapon in evidence, the ACA charge cannot survive.

Self-Defense / Justification

Missouri's Castle Doctrine and Stand Your Ground provisions (RSMo §563.031) provide broad protection for individuals who use force — including deadly force — in defense of themselves or others. If justified force is established, both the underlying felony and the ACA charge can be defeated.

Identity and Misidentification

In cases involving multiple participants or chaotic scenes, misidentification is a real risk. Eyewitness testimony is notoriously unreliable, and establishing that the wrong person was charged can dismantle the prosecution's entire theory.

Why Armed Criminal Action Cases Are Different in Kansas City

ACA is charged frequently across Missouri, but in the Kansas City metro — particularly in Jackson County — it has its own character. Jackson County prosecutors file ACA at high rates relative to the rest of the state, often using it as leverage in plea negotiations for violent crimes, drug cases involving firearms, and robbery charges.

Understanding how the Jackson County Prosecutor's Office, the Clay County Prosecutor's Office, and the Platte County Prosecutor's Office each approach ACA — their typical plea postures, their filing patterns, and how their offices handle suppression issues — is something that comes from practicing in these courtrooms regularly. A defense strategy that works in one county may need to be adjusted for another, even within the same metro area.

This is one of the reasons hiring a local Kansas City defense attorney with direct experience in these specific courts matters. The law is the same statewide, but the practice of law varies courthouse to courthouse.

Courts Where We Defend ACA Cases

The Hartley Law Firm regularly handles Armed Criminal Action cases in courts across the Kansas City metropolitan area.

Jackson County

The highest volume of ACA filings in the KC metro. Cases are heard at the Jackson County Courthouse in downtown Kansas City and the Eastern Jackson County Courthouse in Independence.

Clay County

Cases heard at the Clay County Courthouse in Liberty. ACA charges frequently arise from incidents in the Northland, Liberty, Gladstone, and surrounding areas.

Platte County

Cases handled at the Platte County Courthouse in Platte City. Platte County cases often involve incidents along the I-29 corridor and in Parkville, Platte City, and surrounding areas.

Cass County

Cases heard at the Cass County Courthouse in Harrisonville. ACA charges in Cass County frequently arise from incidents along the I-49 corridor and in Belton, Raymore, and Pleasant Hill.

Proven Results in Armed Criminal Action Cases

The Hartley Law Firm has successfully defended clients facing Armed Criminal Action charges across the Kansas City metro, achieving outcomes including:

ACA Charges Dismissed Felonies Reduced to Misdemeanors Evidence Suppressed Not Guilty Verdicts Charges Dropped Pre-Trial

Past results do not guarantee future outcomes. Each case is unique.

Frequently Asked Questions About Armed Criminal Action

Can I get probation for Armed Criminal Action in Missouri?
No. Under RSMo §571.015, Armed Criminal Action carries a mandatory minimum prison sentence of three years for a first offense. Probation, suspended imposition of sentence (SIS), and suspended execution of sentence (SES) are all unavailable for ACA convictions. This is one of the reasons fighting the charge — rather than simply pleading — is so important.
What is the minimum sentence for Armed Criminal Action?
The minimum sentence is 3 years for a first offense, 5 years for a second offense, and 10 years for a third or subsequent offense. There is no statutory maximum — the court has discretion to impose any sentence above the minimum. The ACA sentence is served consecutively to (after) the sentence for the underlying felony.
Does the ACA sentence run at the same time as my other charges?
No. Missouri law requires that the ACA sentence run consecutively — meaning after — the sentence for the underlying felony. This is mandatory and cannot be modified by the judge. If you receive 10 years on an assault charge and 3 years on the ACA charge, you are looking at 13 years total, not 10.
What counts as a "dangerous instrument" under Missouri's ACA law?
Missouri law defines "dangerous instrument" broadly. While firearms are the most common basis for ACA charges, the statute also covers knives, vehicles used as weapons, blunt objects, and essentially any item used in a manner capable of causing death or serious physical injury. The key question is not what the object is, but how it was used.
Can Armed Criminal Action be dismissed even if the underlying felony stands?
Yes. ACA is a separate charge with its own elements. If the defense can show that the weapon was not "used" in the commission of the felony — for example, that it was merely present but played no active role — the ACA charge can be dismissed or reduced even if the defendant is convicted of the underlying offense. This is a common and important defense strategy.
If the weapon was found during an illegal search, can the ACA charge be dropped?
Potentially, yes. If the weapon was discovered in violation of your Fourth Amendment rights — for example, during a search without a warrant or without probable cause — a successful motion to suppress would exclude the weapon from evidence. Without the weapon, the prosecution typically cannot sustain the ACA charge. This is why it is critical to have an attorney review the circumstances of your arrest and any searches immediately.
How is Armed Criminal Action different from Unlawful Use of a Weapon?
Unlawful Use of a Weapon (RSMo §571.030) is a standalone offense — you can be charged with it even without committing any other crime. Armed Criminal Action, by contrast, always requires an underlying felony. ACA is an add-on charge that enhances the punishment for the underlying offense. The two charges have different elements, different sentencing structures, and different defense strategies.
I wasn't the one holding the weapon. Can I still be charged with ACA?
Yes. Under Missouri law, a person can be charged with ACA if they knowingly assisted in using the weapon or made it available for use during the felony. Accomplice liability can extend ACA charges to individuals who did not personally wield the weapon. However, this is an area with significant room for defense, particularly around the question of whether the defendant had knowledge of the weapon and intent to facilitate its use.
Should I take a plea deal on an Armed Criminal Action charge?
That depends entirely on the facts of your case, the strength of the evidence, and what the State is offering. In many cases, prosecutors will offer to dismiss the ACA count in exchange for a plea on the underlying felony — which can mean the difference between a mandatory prison sentence and probation eligibility. This is one of the most consequential decisions you will make, and it should never be made without the guidance of an experienced defense attorney who has reviewed every detail of your case.
How quickly do I need to hire a lawyer after being charged with ACA?
Immediately. Evidence can be lost, witnesses' memories fade, and early investigation by your attorney can uncover constitutional violations or weaknesses in the State's case that may not be available later. If you or a loved one has been charged with Armed Criminal Action, call The Hartley Law Firm at 816-451-0909 for a free consultation as soon as possible.

Facing Armed Criminal Action Charges?

The consequences are too serious to wait. Call The Hartley Law Firm today for a free, confidential consultation with a Kansas City defense attorney who handles these cases regularly.

Book Your Free Consultation Or call now — 816-451-0909