You’re staring at an MBE Evidence question. The prosecution wants to introduce evidence that the defendant committed three prior burglaries to prove he committed this burglary. Your gut screams “character evidence — inadmissible!” But then you see the answer choice mentioning FRE 404(b) and MIMIC, and suddenly you’re second-guessing everything. Sound familiar?

Here’s the truth: FRE 404(b) other acts evidence trips up more bar examinees than almost any other Evidence rule. The MBE loves testing it because it requires you to distinguish between forbidden propensity reasoning and permissible non-propensity purposes. The difference between getting these questions right and wrong often comes down to whether you’ve internalized the MIMIC framework — and whether you can spot it quickly under pressure.

What FRE 404(b) Actually Prohibits

Let’s start with the foundational rule. FRE 404(b)(1) prohibits using evidence of a crime, wrong, or other act to prove a person’s character in order to show that on a particular occasion, the person acted in accordance with that character. This is the propensity inference — the forbidden “he did it before, so he probably did it again” reasoning.

The classic example: The defendant is charged with armed robbery. The prosecution cannot introduce evidence that he committed five prior armed robberies simply to prove “he’s a robber, so he probably robbed this victim too.” That’s pure propensity evidence, and it’s inadmissible under 404(b)(1).

But here’s where the MBE gets tricky. FRE 404(b)(2) immediately creates exceptions. Evidence of other crimes, wrongs, or acts may be admissible for another purpose, such as proving motive, opportunity, intent, preparation, plan, knowledge, identity, absence of mistake, or lack of accident. This is where MIMIC comes in.

Understanding the MIMIC Mnemonic

MIMIC is a memory device for the most common permissible purposes under FRE 404(b)(2):

M — Motive
I — Intent
M — Mistake (absence of) or identity (when method shows a distinctive modus operandi)
I — Identity
C — Common plan or scheme

Some bar prep courses expand this to MIMIC-KOP (adding Knowledge, Opportunity, and Preparation), but the core MIMIC categories capture the purposes you’ll see most often on the MBE.

The key insight: When evidence of a prior act is offered for a MIMIC purpose, it’s not being used to show propensity. It’s being used to prove a specific element or defense in the current case through a logical chain that doesn’t depend on character inference.

How Each MIMIC Category Works on the MBE

Motive

Motive evidence shows why the defendant committed the charged act. The prior act establishes a reason for the current conduct.

Example: The defendant is charged with murdering his business partner. Evidence that the defendant embezzled $200,000 from their joint account two weeks before the murder is admissible to prove motive — he killed to prevent discovery of the embezzlement. This isn’t propensity reasoning (“he’s a criminal type”). It’s showing a specific reason he wanted this particular victim dead.

Intent

Intent evidence proves the defendant acted with the required mental state, especially when the defendant claims the act was accidental or innocent.

Example: The defendant is charged with arson for burning down his restaurant. He claims it was an accidental kitchen fire. Evidence that he burned down a previous restaurant five years ago for insurance money is admissible to prove intent — it shows this fire was also deliberate, not accidental. The prior act rebuts the accident defense by showing a pattern of intentional conduct.

Watch for MBE questions where the defendant raises a mistake or accident defense. That’s your signal that prior acts might come in to prove intent.

Absence of Mistake or Accident

This overlaps with intent but focuses specifically on negating innocent explanations. If something happened once, maybe it was an accident. If it happened three times in identical circumstances? Not likely.

Example: A doctor is charged with illegally prescribing opioids. She claims she made an honest mistake about the patients’ medical needs. Evidence that she wrote similar prescriptions for 47 other patients — all of whom turned out to be drug dealers — proves absence of mistake. One prescription might be an error. Forty-seven follows a pattern.

Identity (Modus Operandi)

Identity evidence is admissible when the prior act shows such a distinctive method of operation that it serves as the defendant’s “signature.”

This is the narrowest MIMIC category. The prior act must be so similar to the charged crime that it’s like a fingerprint. Generic similarities don’t cut it.

Example: The defendant is charged with bank robbery. In both the charged robbery and a prior robbery, the perpetrator wore a purple ski mask, demanded money in Spanish, and left behind a handwritten note quoting Shakespeare. That’s distinctive enough to identify the defendant. But if the similarity is just “both robberies involved a handgun and a demand note,” that’s too generic — inadmissible propensity evidence.

The MBE will try to trick you with identity questions by offering prior acts that are similar but not distinctively similar.

Common Plan or Scheme

Common plan evidence shows the charged act was part of a larger ongoing scheme, or that the defendant used the same preparatory steps.

Example: The defendant is charged with burglarizing a jewelry store on March 15. Evidence that he burglarized three other jewelry stores in the same neighborhood during the prior two months, always disabling the same brand of alarm system, is admissible to show common plan. The prior acts demonstrate this wasn’t an isolated incident but part of a planned series.

On the MBE, look for fact patterns involving multiple similar incidents over time. If the prosecution is trying to show the charged act fits a pattern of planned behavior, it’s likely a common plan question.

The Two-Step Analysis for FRE 404(b) MBE Questions

When you spot a 404(b) issue on the MBE, use this framework:

Step 1: Identify the purpose. Why is the evidence being offered? If it’s to prove “the defendant is a bad person who does bad things,” it’s inadmissible propensity evidence. If it’s to prove a specific MIMIC purpose (or another legitimate non-propensity purpose like opportunity, preparation, or knowledge), it’s potentially admissible.

Step 2: Apply FRE 403 balancing. Even if the evidence has a permissible purpose, the court must still exclude it if its probative value is substantially outweighed by the danger of unfair prejudice. The MBE occasionally tests this second step, usually in criminal cases where prior bad acts are highly inflammatory.

Here’s the critical distinction: FRE 403 uses “substantially outweighed” language, meaning there’s a thumb on the scale in favor of admission. Evidence has to be really prejudicial — not just damaging — to get excluded under 403.

Spotting FRE 404(b) Issues in MBE Fact Patterns

The MBE telegraphs 404(b) questions with certain recurring setups:

When you see these signals, immediately ask: What is the prosecution trying to prove with this evidence? Match that purpose to a MIMIC category.

Common MBE Traps with Other Acts Evidence

Trap #1: Confusing similar with distinctive. The MBE loves offering prior acts that are somewhat similar to the charged crime and asking whether they’re admissible to prove identity. Remember: unless the similarity is distinctive (almost like a signature), it’s just propensity evidence in disguise.

Trap #2: Missing the absence-of-mistake defense. When a defendant claims “I didn’t know” or “I thought it was legal,” that opens the door to prior acts proving knowledge or absence of mistake. The MBE will bury this defense in the facts and see if you catch it.

Trap #3: Forgetting that 404(b) applies to civil cases too. Most bar prep examples use criminal prosecutions, but 404(b) also governs civil cases. A plaintiff in a fraud case can’t use the defendant’s prior frauds to show propensity, but can use them to prove knowledge, intent, or common scheme.

Trap #4: Assuming all prior bad acts are inadmissible. Many students overcorrect and think any evidence of prior misconduct is automatically excludable. Not true. If it has a permissible non-propensity purpose and survives 403 balancing, it comes in.

The Limiting Instruction Requirement

Here’s a procedural detail the MBE occasionally tests: When other acts evidence is admitted under FRE 404(b), the defendant is entitled to a limiting instruction under FRE 105. The judge must instruct the jury that the evidence may be considered only for the permissible purpose (e.g., “to prove intent, not to show the defendant is a bad person”).

If you see an answer choice about limiting instructions in a 404(b) question, it’s often correct — especially if the question asks what the court should do upon the defendant’s request.

What to Memorize for FRE 404(b) on the MBE

Lock in these core principles:

  1. The rule: Evidence of other crimes, wrongs, or acts is inadmissible to prove propensity, but admissible for other purposes like MIMIC.

  2. The MIMIC categories: Motive, Intent, absence of Mistake, Identity (with distinctive modus operandi), and Common plan.

  3. The analysis: First, identify a permissible non-propensity purpose. Second, apply FRE 403 balancing (substantially outweighed standard).

  4. Identity requires distinctiveness: Generic similarities don’t prove identity. The method must be signature-like.

  5. Absence of mistake pairs with defendant’s claim: When the defendant says “accident” or “I didn’t know,” prior acts proving intent or knowledge become admissible.

  6. Limiting instructions are available: Under FRE 105, the defendant can request that the jury be instructed to consider the evidence only for its permissible purpose.

Pulling It All Together for Bar Exam Success

FRE 404(b) questions reward pattern recognition. The more practice questions you do, the faster you’ll spot the permissible purpose buried in the fact pattern. Train yourself to ask immediately: “Why is the prosecution offering this evidence?” If the answer is anything other than “to show the defendant is a criminal type,” you’re likely looking at admissible evidence.

The FlashTables Evidence table covers FRE 404(b) alongside the complete propensity evidence framework, giving you the rule structure and common-plan variations in a format built for active recall. When you’re drilling Evidence rules in the final weeks before the bar, having all the character evidence rules — including 404(b), 404(a), 405, and 608 — organized in one place makes it easier to distinguish between the different admissibility standards and avoid mixing up the categories.

Walk into the MBE knowing MIMIC cold. When you see other acts evidence in a fact pattern, you’ll have a systematic way to evaluate it — and you’ll pick up points that other examinees miss because they’re still guessing between “inadmissible character evidence” and “admissible to prove intent.” That difference adds up across 200 questions.