You know that sinking feeling when an MBE question starts with “A and B agreed to rob a bank…”? Your brain immediately scrambles to remember: Do I need an overt act? Is A liable for what B does? What if C joins later? Conspiracy questions trip up bar examinees precisely because they test multiple layers of liability at once.
Let’s break down exactly what you need to know about conspiracy on the MBE, including the elements, the overt act requirement, and how co-conspirator liability works.
What Makes Conspiracy Different from Other Inchoate Crimes
Conspiracy is a specific intent crime that punishes the agreement itself, not just the completed target offense. This is fundamentally different from attempt, which requires a substantial step toward completion.
The basic elements of conspiracy MBE questions test are:
- An agreement between two or more persons to commit an unlawful act
- The intent to achieve the objective of the agreement
- An overt act in furtherance of the conspiracy (majority rule)
That third element causes confusion. At common law, no overt act was required—the agreement itself was the crime. But the majority modern rule, which the MBE follows, requires at least one conspirator to take some overt act in furtherance of the conspiracy. The good news? Even a minor preparatory act suffices. Buying supplies, making a phone call, or conducting surveillance all count.
Here’s what matters: the overt act can be committed by any member of the conspiracy, not necessarily the defendant being charged.
The Agreement Element: What Counts?
The agreement doesn’t require a formal sit-down meeting or written contract. An implicit understanding is enough. If two people coordinate their actions toward an unlawful goal with mutual awareness, that’s an agreement.
But here’s where the MBE tests a crucial distinction: bilateral versus unilateral conspiracy.
Under the common law bilateral approach, you need at least two guilty minds. If one person is an undercover officer or just pretending to agree, there’s no conspiracy because you don’t have two people genuinely agreeing.
Under the Model Penal Code unilateral approach, only one person needs to genuinely agree. A defendant can be convicted even if the other “conspirator” was faking it the whole time.
The MBE typically follows the unilateral approach in its questions, but watch the call of the question. If it asks about “common law conspiracy,” you need the bilateral rule.
Example: Testing the Agreement Element
Imagine this fact pattern: Alex approaches Bailey and proposes they burglarize a jewelry store. Bailey, who is actually working with police, agrees and suggests they meet the next day to plan. Alex shows up with burglary tools. Has Alex committed conspiracy?
Under the unilateral approach: Yes. Alex genuinely agreed and intended to commit burglary. The fact that Bailey was faking doesn’t negate Alex’s culpability.
Under the bilateral approach: No. There was never a true meeting of the minds between two guilty parties.
The MBE loves this distinction because it tests whether you understand the policy behind conspiracy law—we punish the agreement because coordinated criminal activity poses special dangers to society.
The Overt Act Requirement: How Little Is Enough?
Once you’ve established an agreement with the requisite intent, you need an overt act under the majority rule. Students often overthink this element.
An overt act is any act, no matter how small, that furthers the conspiracy. It doesn’t need to be criminal itself. It doesn’t need to be a “substantial step” like attempt requires. Mere preparation is sufficient.
Consider: Defendant and Co-conspirator agree to rob a bank. Defendant goes to the bank and observes the security cameras. That’s an overt act. Co-conspirator buys ski masks at a sporting goods store. That’s an overt act. Either one satisfies the requirement for both conspirators.
The overt act requirement exists to show the conspiracy has moved beyond abstract discussion into concrete action. But the bar is deliberately low—courts want to intervene before the target crime is completed.
Co-Conspirator Liability: The Pinkerton Rule
Here’s where conspiracy gets dangerous for defendants: the Pinkerton rule makes each conspirator liable for all foreseeable crimes committed by co-conspirators in furtherance of the conspiracy.
This is separate from accomplice liability. You don’t need to aid, abet, or encourage the specific crime. Your membership in the conspiracy is enough.
The crime must meet two requirements:
- It must be committed in furtherance of the conspiracy
- It must be a reasonably foreseeable consequence of the conspiratorial agreement
Let’s work through an example: Adam and Beth conspire to commit armed robbery of a liquor store. During the robbery, Beth shoots and kills the clerk. Is Adam liable for murder?
Under Pinkerton, yes—if the murder was foreseeable. Armed robbery inherently involves the risk of deadly force. A jury could easily find that a killing during an armed robbery is a foreseeable consequence, even if Adam explicitly told Beth not to hurt anyone.
But what if Beth, on the way out, decides to also steal a car in the parking lot? That’s less clear. Auto theft isn’t necessarily in furtherance of the robbery conspiracy. It’s a separate crime of opportunity. Adam likely isn’t liable under Pinkerton for that.
Conspiracy Doesn’t Merge
Unlike attempt, conspiracy does not merge with the completed offense. This is a favorite MBE trap.
If defendants conspire to commit robbery and then actually commit the robbery, they can be convicted of both conspiracy to commit robbery and robbery itself. The conspiracy is a separate crime that punishes the agreement and the danger of group criminality.
You’ll see this tested in questions asking “what crimes can the defendant be convicted of?” Don’t eliminate conspiracy just because the target crime was completed.
Withdrawal from Conspiracy
Can you get out of a conspiracy once you’ve joined? The rules are strict.
At common law, withdrawal is not a defense to the conspiracy itself. Once you’ve agreed and an overt act has occurred, you’ve completed the crime of conspiracy. You can’t un-conspire.
However, withdrawal can limit your liability for subsequent crimes committed by co-conspirators. To effectively withdraw, you must:
- Notify all co-conspirators of your withdrawal, or
- Inform law enforcement of the conspiracy
Simply deciding privately that you’re done doesn’t cut it. You need affirmative action that communicates withdrawal.
Even then, you’re still guilty of conspiracy. Withdrawal only prevents liability under Pinkerton for crimes committed after your withdrawal.
The Model Penal Code recognizes a narrow exception: voluntary and complete abandonment can be a defense to conspiracy if it’s not motivated by a decision to postpone the crime or switch to a different target. But this is the minority rule and rarely tested on the MBE.
Common MBE Traps with Conspiracy
Trap #1: Assuming you need a substantial step. You don’t. Conspiracy requires only an overt act (any act), which is a much lower threshold than attempt’s substantial step.
Trap #2: Thinking withdrawal is a complete defense. It’s not. Withdrawal only limits future liability under Pinkerton; you’re still guilty of the conspiracy itself.
Trap #3: Forgetting that each conspirator can be liable for crimes they didn’t personally commit. The Pinkerton rule is broad. If it’s foreseeable and in furtherance, you’re liable.
Trap #4: Applying the bilateral rule when the question uses Model Penal Code language. Watch for signals about which approach applies.
Trap #5: Thinking conspiracy merges. It doesn’t. You can be convicted of both conspiracy and the target crime.
Putting It All Together: A Full Hypothetical
Here’s an MBE-style fact pattern that tests multiple conspiracy issues:
Carlos and Diana agree to burglarize a warehouse. Carlos buys crowbars and bolt cutters. Before they can commit the burglary, Ethan approaches them and offers to help. All three agree to proceed. On the night of the burglary, Carlos decides he doesn’t want to participate and sends a text to Diana saying “I’m out.” Diana and Ethan proceed with the burglary. During the burglary, Ethan assaults a security guard who unexpectedly appears. The guard suffers serious injuries.
Question: Is Carlos liable for the assault on the security guard?
Analysis: Carlos is guilty of conspiracy to commit burglary (agreement + intent + overt act of buying tools). The question is whether he’s liable under Pinkerton for Ethan’s assault.
Carlos attempted to withdraw by notifying Diana. But he didn’t notify Ethan, and he didn’t inform law enforcement. His withdrawal was incomplete. Even if his withdrawal were effective, it only occurred moments before the burglary—likely too late to negate liability for foreseeable crimes during the burglary itself.
Is the assault foreseeable? Burglary involves unlawful entry of a structure. While not as inherently dangerous as armed robbery, encountering security personnel is a foreseeable risk. A court could find the assault was a reasonably foreseeable consequence of burglarizing an occupied warehouse.
Carlos is likely liable for the assault under Pinkerton, despite his attempted withdrawal.
What You Need to Memorize for Test Day
For conspiracy questions on the MBE, lock in these rules:
Elements: (1) Agreement between two or more persons, (2) intent to achieve the unlawful objective, (3) overt act in furtherance (majority rule—any act suffices).
Bilateral vs. Unilateral: Common law requires two guilty minds; MPC allows conviction even if the other party is feigning.
Pinkerton Rule: Each conspirator is liable for all foreseeable crimes committed by co-conspirators in furtherance of the conspiracy.
No Merger: Conspiracy does not merge with the completed offense. You can be convicted of both.
Withdrawal: Doesn’t erase conspiracy liability, but can limit liability for subsequent crimes if you notify all co-conspirators or inform authorities.
Overt Act: Far less demanding than the substantial step required for attempt. Mere preparation counts.
If you want all 104 criminal law rules organized for active recall—including the complete conspiracy framework, Pinkerton liability, and every inchoate crime distinction the MBE tests—FlashTables Criminal Law & Procedure covers this in a structured two-column format designed for efficient memorization. The table format makes it easy to drill the elements and spot the issues when you’re working through practice questions.
Conspiracy questions test your ability to track multiple parties and multiple layers of liability simultaneously. Master the elements, understand when Pinkerton applies, and remember that the agreement itself is the crime—everything else flows from that core principle. You’ve got this.