- What it is:someone else did it.
- Standard:real connection, not speculation.
- Needs:evidentiary foundation.
- Decided:admissibility ruling by judge.
The alternative-perpetrator defense lets the accused offer evidence that someone else committed the crime. It flows from the constitutional right to present a complete defense — but Minnesota does not let a defendant simply point a finger at a random person. There is a foundation you must lay first, and a legal standard the evidence has to meet. Here's how the defense works and what it takes to get this evidence in front of a jury.
Where the Defense Comes From
A defendant has a constitutional right to present a complete defense, and that includes offering evidence that a third party — not the defendant — committed the offense. Because the State must prove the defendant's identity as the perpetrator beyond a reasonable doubt, evidence that genuinely points to someone else can create exactly the reasonable doubt that requires acquittal.
What this means for you: This is more than "it could have been anybody." Done right, it gives the jury an affirmative, evidence-based reason to doubt that you are the person who committed the crime.
The Foundation Requirement
Minnesota courts do not allow speculative finger-pointing. Before alternative-perpetrator evidence is admitted, the defense generally must lay a foundation — evidence that has an inherent tendency to connect the alleged alternative perpetrator to the actual commission of the crime. Vague suspicion, motive alone, or "this other person is the kind of person who might do this" is not enough on its own.
What this means for you: The evidence needs a real link — the other person's presence, opportunity, conduct, statements, forensic connection, or similar proof tying them to this crime. Identifying and developing that link is investigative work that takes time and resources.
What Can Come In Once the Foundation Is Laid
Once the threshold connection is established, the defense may be able to introduce a broader range of evidence about the alternative perpetrator — including, in some cases, that person's motive, opportunity, and even certain prior conduct or other bad acts that tend to show they committed this offense. The foundation requirement is the gate; clearing it opens the door to a fuller presentation.
Reverse-Spreigl Evidence
When the defense offers evidence of an alternative perpetrator's other crimes or bad acts to show that person — not the defendant — committed the charged offense, it is sometimes called "reverse-Spreigl" evidence. It mirrors the State's use of other-acts evidence, but it is offered by the defense to point guilt elsewhere. It has its own foundational requirements and is decided by the trial court.
How It Fits With Identity Defenses
Alternative-perpetrator evidence is closely related to mistaken identification and alibi. The strongest version of the defense often combines them: the State's identification of the defendant is weak, the defendant has evidence of being elsewhere, and there is affirmative proof pointing to a specific other person. Together, these can be far more persuasive than any one alone.
Why Early Investigation Matters
Building a viable alternative-perpetrator theory depends on evidence that is often perishable — surveillance footage, phone records, witness memories, physical evidence, and digital data. The connection the law requires has to be supported, not merely asserted, and the proof needed to support it can disappear quickly.
What this means for you: If you believe someone else committed the crime you're charged with, the time to develop that evidence is early. The foundation requirement means the defense has to be built, not just argued.
Updated May 18, 2026 · Law verified as of June 17, 2026. This article is general information about Minnesota law, not legal advice.
Frequently Asked Questions
Can I just argue that someone else did it?
Not without a foundation. Minnesota requires evidence with an inherent tendency to connect a specific other person to the actual commission of the crime. Speculation or motive alone is generally not enough.
What is the "inherent tendency" standard?
It is the threshold the defense must meet to admit alternative-perpetrator evidence: the proof must genuinely tend to link the other person to committing this offense, not merely suggest they are a bad person or had a reason to do it.
What is reverse-Spreigl evidence?
It is evidence of an alternative perpetrator's other crimes or bad acts, offered by the defense to show that person committed the charged offense. It mirrors the State's other-acts evidence and has its own foundational requirements.
Does this defense work with an alibi?
Often, yes. Combining a weak State identification, alibi evidence, and proof pointing to a specific other person can substantially strengthen the case for reasonable doubt.
Who decides whether the evidence comes in?
The trial judge decides whether the defense has laid an adequate foundation. If the threshold is met, the jury then weighs the evidence along with everything else in the case.
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Read the guideThe information on this article is for general informational purposes only and is not legal advice. Reading this article does not create an attorney-client relationship.