---
title: "Accomplice Liability"
type: Legal Rule
source: https://casebriefly.com/legal-rules/accomplice-liability
---

# Accomplice Liability

Accomplice liability holds a person criminally responsible for another's crime when they intentionally aid, abet, encourage, or assist in its commission. The accomplice is liable for the same crime as the principal.

## Definition

Accomplice liability is a theory of derivative liability that holds a person responsible for the criminal acts of another when the accomplice intentionally assists, encourages, or facilitates the commission of the crime. Unlike conspiracy, which punishes the agreement itself, accomplice liability imposes guilt for the substantive offense committed by the principal. The accomplice is treated as if they had committed the crime themselves and faces the same charges and penalties as the principal.

The mens rea for accomplice liability requires dual intent: the intent to assist the principal and the intent that the principal commit the underlying offense. Mere knowledge that a crime will occur is generally insufficient, though some jurisdictions impose liability when a person provides substantial facilitation with knowledge of the criminal purpose. The actus reus requires some affirmative act of assistance, encouragement, or facilitation, though the assistance need not be substantial or even successful. Mere presence at the scene of a crime, without more, is insufficient.

At common law, parties to a crime were classified as principals in the first degree (actual perpetrators), principals in the second degree (present and aiding), accessories before the fact (aiding beforehand but absent), and accessories after the fact (assisting after the crime). Modern law has largely abolished these distinctions, treating all accomplices as principals. The MPC follows this approach, holding an accomplice liable for the substantive offense. An accomplice can be convicted even if the principal is acquitted, as long as the prosecution proves the crime was committed and the defendant aided it with the requisite intent. Withdrawal requires the accomplice to communicate renunciation to the principal and take steps to neutralize any prior assistance.

## Elements

- Intent to assist, aid, abet, or encourage the principal in the commission of the crime
- Intent that the principal commit the underlying offense
- An affirmative act of assistance, encouragement, or facilitation
- The principal commits the criminal offense (or at least attempts it)
- Mere presence at the scene is insufficient without additional aiding or encouraging conduct

## Key Case

Hicks v. United States, 150 U.S. 442 (1893)

## Landmark Cases

| Name | Citation | Significance |
| --- | --- | --- |
| Hicks v. United States | 150 U.S. 442 (1893) | Established that mere presence and failure to object is insufficient for accomplice liability; encouragement must actually be intended to aid |
| State v. Gladstone | 78 Wash. 2d 306 (1970) | Held that merely providing information (directing a buyer to a drug dealer) without intent to further the crime is insufficient for accomplice liability |
| People v. Luparello | 187 Cal. App. 3d 410 (1987) | Held an accomplice liable for the natural and probable consequences of the aided crime, even if unintended by the accomplice |
| Rosemond v. United States | 572 U.S. 65 (2014) | Clarified the intent requirement for aiding and abetting, requiring advance knowledge and facilitation of the offense |

## Exam Tips

- Focus on dual intent: the defendant must intend to help AND intend the crime to be committed
- Distinguish accomplice liability from conspiracy; accomplice liability is derivative of the principal's crime, while conspiracy is a separate offense
- Watch for the natural and probable consequences doctrine, which holds accomplices liable for foreseeable crimes beyond the original plan
- Remember that mere presence, even at the scene of a crime among friends, is not enough for accomplice liability

## Common Mistakes

- Assuming that mere knowledge of criminal activity makes someone an accomplice; knowledge alone without intent to further the crime is generally insufficient
- Confusing accessory after the fact with accomplice liability; an accessory after the fact assists after the crime is complete and is subject to lesser punishment
- Thinking the principal must be convicted for the accomplice to be liable; an accomplice can be convicted even if the principal is never charged or is acquitted

## Mnemonic Or Memory Aid

"AAA" -- Act of Aid with Aim (intent): you need an act of assistance plus the aim that the crime succeed

## Related Rules

- conspiracy
- solicitation
- felony-murder-rule
- attempt

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Source: [Accomplice Liability — CaseBriefly](https://casebriefly.com/legal-rules/accomplice-liability)