Can AI Evidence Be Used in Court in Michigan?

Most people never expect their private thoughts to become part of a police file. But as technology evolves, the question of AI evidence in court in Michigan is becoming more real. When you open an AI app, you're usually looking for clarity. You might be sorting through stress, trying to understand a situation, or just looking for a direct answer you cannot find anywhere else. It often feels like a quiet corner of the internet where you can think out loud without judgment.

However, concern is growing among Michiganders who use AI tools regularly. What happens if something typed in a moment of confusion, frustration, or curiosity ends up in the hands of law enforcement? For many, the issue is not about hiding anything. It is about how quickly a private digital interaction can be reinterpreted as potential evidence. As a result, the line between personal use and AI evidence in court in Michigan is becoming increasingly unclear.

Michigan warrant rules under the Michigan Compiled Laws (MCL) 780.651 weren't built for AI tools and our conversations with them. They were built for human statements, real-world observations, and tangible, verifiable evidence. Now courts are being asked whether a quick message to an AI app can be treated as enough to justify a police search.

Mark Linton is a long-practicing Michigan appellate attorney. And lately, he's been handling Michigan criminal appeals linked to AI chats. And here, he discusses how Michigan law treats these AI chats and why context matters more than ever. He also explains what appellate courts focus on when police try to turn private digital moments into probable cause.

The Legal Foundation of Probable Cause in Michigan

Before we look at how AI conversations fit into probable cause, it's important to anchor everything in Michigan's legal framework. Michigan courts define probable cause as a “fair probability” that the evidence of a crime exists in the place to be searched. 

MCL 780.651 states that a Michigan search warrant may be issued only when a judge or a magistrate finds probable cause. And this should be supported by an oath or affidavit that a crime has been committed, and the crime's evidence is likely located in the place to be searched.

The statute applies to emails, text messages, and social media messages. It's also applicable in GPS and location data, cloud-based storage, and now increasingly, AI chat logs. 

Michigan courts evaluate probable cause by applying an objective standard. The key question is, “Would a reasonably cautious person believe that evidence of a crime is likely to be found?” And several Michigan cases reinforce this principle.

The People v. Kazmierczak (2000) case established that probable cause is based on a “commonsense and realistic interpretation” of facts. 

The People v. Malone (2010) case also held that magistrates may draw reasonable inferences from the facts presented in an affidavit to find probable cause. And these foundational principles naturally extend to AI chat logs.

Can Police Use AI Conversations Alone to Establish Probable Cause?

The truth is, AI chats can contribute to probable cause, but rarely alone. Police are increasingly encountering various unique situations with individuals in Michigan. Some people ask AI systems for advice on illegal acts and end up discussing hypothetical or real wrongdoing. 

Others describe plans involving controlled substances, weapons, or fraud, while another group seeks instructions that appear to show criminal intent. But does any of that create probable cause? 

Michigan law doesn't allow search warrants based on mere speculation or ambiguous statements. And AI statements standing alone often require context. Courts generally evaluate AI chats the same way they evaluate text messages, emails, social media DMs, and search history queries.

And they seek to determine if the chats show intentional steps toward criminal conduct. If not, it means the chats merely reflect curiosity, fantasy, or ambiguous exploration. 

How AI Conversations May Support Probable Cause

 

Situations where AI chats may legitimately support a Michigan warrant include:

When Chats Show Clear Intent or Planning

Someone may use an AI system to ask how to commit a specific crime and even request step-by-step instructions. They may also discuss preparing tools, weapons, or materials, and essentially acknowledge the intent to act. 

In such scenarios, courts may interpret those statements as evidence of planning or preparation. Michigan courts, specifically, treat those statements like admissions or evidence of mens rea (a guilty mind or criminal intent). 

And this aligns with the Michigan past cases that accepted messaging evidence to show intent. The People v. Carson (2025) case is one good example. This case emphasizes that digital data can support probable cause. But that happens only if there's a clear nexus between the digital device or data and the crime in question. 

And the case explicitly mentions that a warrant can be sufficiently particular if it directs law enforcement to specific communications within a relevant timeframe. And those communications may include AI chat logs.

The People v. Hughes (2020) case is another great example. It confirms that digital data like AI chats must be “reasonably directed” toward finding evidence of the specific criminal activity alleged. It also confirms that digital communications can provide evidence of mens rea and criminal conduct.

When Chats are Corroborated By Other Evidence 

This is the strongest and most common scenario. AI chats can be paired with IP address logs, account information, device identifiers, metadata, witness statements, and undercover messages. And this creates a framework that Michigan judges routinely accept as probable cause. 

The Michigan Supreme Court has repeatedly emphasized the importance of corroboration in digital evidence cases. One of them is the People v. Waclawski (2009) case. Here, the Court held that digital communications plus corroboration justified extensive searches.

When Law Enforcement Obtains AI Logs Through a Valid Legal Process 

Police may obtain AI data via search warrants, subpoenas, and investigative subpoenas under MCL 767A.4. They may also acquire the data through emergency disclosure requests, although very rarely. Investigative subpoenas may be used for identifying data like IP addresses and account information.

However, Michigan's Proposal 20-2 requires a full search warrant to access the actual content of AI conversations. Furthermore, these warrants must be strictly particularized. This means they cannot be a general fishing expedition through a user's entire chat history.

Once obtained legally, the chat logs may then support further warrants. Michigan's digital-evidence warrant rules allow police to seize or request various forms of data. This includes server logs, conversations, timestamps, IP data, and account registration details. 

And courts reviewing such warrants focus on source reliability, consistency in the logs, and whether the data links to the suspect.

How Police Typically Obtain AI Chat Logs

In Michigan law, there's been a significant shift from the third-party doctrine regarding digital records. The Michigan Constitution was amended by Proposal 20-2 in 2020. And it now explicitly protects electronic communications. This means that the state now recognizes a categorical expectation of privacy in electronic communications regardless of their third-party storage.

The third-party doctrine was traditionally applied in cases like People v. Perlis (1990), where privacy wasn't upheld. However, Michigan voters ended this framework. And this new heightened protection by the proposal is supported by two foundations. These include Article I, Section 11 of the Michigan Constitution and Michigan case law. 

Consequently, law enforcement must obtain a full search warrant to seize AI content. The old third-party exceptions no longer apply to modern digital conversations in Michigan. 

What Michigan Appellate Courts Look For When AI Evidence is Used in a Warrant 

Michigan courts focus on three questions when a defendant challenges probable cause on appeal. These questions are:

Was the affidavit sufficient on its face? MCL 780.653 states that an affidavit must contain facts (not conclusions) supporting probable cause. Appellate courts evaluate whether the affidavit showed a nexus between the AI chat and the suspected crime. 

They also assess whether the affiant explained how the chat was obtained and whether metadata or provider verification supported authenticity. Courts do not allow magistrates to rely on “bare bones" affidavits. 

Did the officer connect the substance of the chats to the premise listed in the warrant? This is where many warrants fail. Michigan appellate courts require a clear connection between the AI chats, the device used, and the location where the evidence is allegedly kept. 

This principle appears in many cases, including the People v. Brown (2012) case. Here, the court held that a warrant must show why the evidence is likely to be found in the location named. Michigan precedent also reaffirmed that the nexus must be more than speculative. 

Police may have AI chats but cannot tie them to a specific device, user, or address. And in such scenarios, the warrant is vulnerable on appeal.

Was the information too stale? Probable cause must be timely. Michigan courts consider how old the AI chat logs are and whether they relate to ongoing conduct. They also seek to determine whether technology suggests evidence is still present. 

The People v. Russo (1992) case held that staleness depends on the nature of the crime and the evidence. AI logs may retain evidentiary value for a long time, but the affidavit must explain why. According to the Russo case, staleness is balanced against the durability of the evidence. 

Michigan often views AI logs as having a long evidentiary life because they're stored indefinitely in the cloud. The People v. Carson (2025) case, however, insists that the affidavit must still explain why this specific user is likely to still have access to that account or device at the time of the search. 

When AI Chats Do Not Establish Probable Cause 

Not every AI conversation is incriminating. Courts essentially reject probable cause when:

The chats are ambiguous or hypothetical - People often explore illegal topics out of curiosity, academic research, fiction writing, or even philosophical discussion. And without additional context, such chats do not establish probable cause.

The chats cannot be tied to the defendant - If officers cannot show who sent the prompt, what device was used, or whether the user was actually the suspect, the warrant may be invalid. The law requires police to “put the suspect behind the keyboard.” And they do this by linking the AI account to the defendant's IP address, email, or physical possession at the time of the prompt.

The logs are incomplete, edited or unverified - AI chat logs can be copied, exported, or altered. The affidavit must explain how the logs were acquired, why they are reliable, and what ties them to the investigation. Michigan courts that deal with criminal appeals routinely scrutinize digital evidence reliability. 

What This Means for Defendants 

AI evidence is new, but the legal principles are not. Michigan courts are applying long-standing digital evidence rules to AI conversations. And you, as the defendant, should be aware of several things. 

The first is that police can actually use AI chats as part of probable cause. However, they must corroborate, verify, and connect them to you. They must also place them within the scope of MCL 780.651.

Secondly, many warrants involving AI evidence are vulnerable on appeal. And when challenging such evidence, appeals advocates usually target insufficient nexus, lack of corroboration, and staleness. They also argue and focus on demonstrating how unreliable the data sources are and how incomplete or altered the logs may be.

Thirdly, Michigan courts are still developing the law. And as AI becomes more central to investigations, appellate challenges will start shaping future law. Sometimes, defendants may believe AI conversations were misused or used without proper legal grounding. And if you're one of them, you should seek appellate review immediately. 

Did you type a few lines into an app and they suddenly turned into evidence against you? Well, you need a Michigan appeals lawyer who speaks both tech and law fluently. And Mark Linton is that lawyer. If your case now hinges on a chat you barely remember, he's the one you want decoding it. Contact Mark Linton today to have your case reviewed.