Traffic Stops and Searches in Michigan: When Do Police Need a Warrant?

People call our office convinced that because the officer found something, the search must have been legal. It does not work that way. The question is not what the officer found — it is whether the officer was allowed to look, and a judge decides that afterward, on the facts of your stop.

An officer needs a reason to pull you over — but not much of one

The Fourth Amendment and Const 1963, art 1, sec 11 both protect you from unreasonable searches and seizures, and Michigan's provision is at least as protective as the federal one. A traffic stop is a seizure, so it needs a justification.

The bar is low. Under Terry v Ohio, 392 US 1 (1968), an officer needs reasonable suspicion — specific, articulable facts, not a hunch. A traffic violation qualifies, even a minor civil one: a burned-out plate light, a lane drift. And under Whren v United States, 517 US 806 (1996), an officer's ulterior motive does not make the stop unlawful if the violation itself gave grounds for it. So "he only stopped me for a taillight" is rarely the strongest place to look. What happens after the stop usually is.

The stop cannot last longer than its purpose

In Rodriguez v United States, 575 US 348 (2015), the Supreme Court held that police may not extend a traffic stop to conduct a dog sniff without independent reasonable suspicion. The stop's "mission" defines how long it may last. Once the officer has handled the ticket, license, and registration, holding you to wait for a canine unit needs a new justification. If your stop ran long, the timeline matters — dash and body camera timestamps, where they exist, are often where it can be checked.

Out of the car is not the same as searched

An officer may order the driver out during a lawful stop. Pennsylvania v Mimms, 434 US 106 (1977), permits that for officer safety without additional suspicion, and Maryland v Wilson, 519 US 408 (1997), extends the rule to passengers. But being ordered out is not being searched. A pat-down under Terry is limited to an outer-clothing check for weapons, justified by reasonable suspicion that you are armed and dangerous — not a license to search your pockets for drugs.

Searching the car: what Michigan recently changed

Vehicles are treated differently from houses. Under the automobile exception, traced to Carroll v United States, 267 US 132 (1925), police may search a vehicle without a warrant if they have probable cause to believe it holds evidence of a crime. Two recent Michigan Supreme Court decisions narrowed that.

In People v Armstrong, ___ Mich ___; ___ NW3d ___ (2025) (Docket No. 165233), the Court held that the smell of marijuana alone no longer establishes probable cause to search a vehicle, overruling People v Kazmierczak, 461 Mich 411 (2000), on that point. Because the Michigan Regulation and Taxation of Marihuana Act made adult possession generally lawful, odor no longer reliably signals contraband. It can be one factor, but cannot carry a search by itself.

Then in People v Wilkins, ___ Mich ___; ___ NW3d ___ (2026) (Docket No. 167737) — a case that came up through the Kent Circuit Court — the Court went further. The automobile exception does not authorize a warrantless search when the officer has probable cause to believe only a civil infraction occurred. Substances prohibited solely by civil law are not "contraband" for purposes of justifying such a search.

Amount and age separate a civil infraction from a crime. Under MCL 333.27965(3), for someone under 21, possession of not more than 2.5 ounces is a civil infraction on a first or second violation. Adult thresholds differ — under MCL 333.27955, 2.5 ounces or less is lawful at 21 or older, and MCL 333.27965(2) and (4) put the criminal line above twice the statutory amount. So Wilkins turns on whether probable cause pointed to a criminal amount, not on one magic number.

Two cautions. Wilkins is not limited to marijuana — its logic reaches any case where the only thing an officer has probable cause to suspect is a civil violation. And the majority decided it under the Fourth Amendment, reserving whether Michigan's constitution gives broader protection.

Consent, phones, and arrest

• Consent. If you agree, the search is generally lawful, and the scope of what you agreed to matters. Declining is not itself a crime. But declining does not mean no search happens — officers may still search on an independent legal basis, and physically interfering is a separate offense. Decline clearly, do not resist, ask for a lawyer.

  
  

• Your phone. Under Riley v California, 573 US 373 (2014), officers generally need a warrant for a phone's digital contents, and Michigan's constitution was amended in 2020 to name electronic data among the things protected. But unlocking it yourself generally gives that away, and whether you can be made to supply a passcode or thumbprint is unsettled. Do not improvise that at the roadside.

  
  

• Search incident to arrest. Arizona v Gant, 556 US 332 (2009), limits post-arrest vehicle searches to where the arrestee could actually reach the passenger compartment, or where it is reasonable to believe the vehicle holds evidence of the offense of arrest.

  
  

• Plain view. What an officer sees from a lawful vantage point is fair game; what took moving, opening, or digging generally is not.

  
  

What this means for you

If you were charged with something found during a traffic stop, the search is not background detail — it is often the case itself. A motion to suppress asks the court to exclude evidence obtained unlawfully, and it gets built from specifics: the stated reason for the stop, the sequence and timing of what the officer did, whether consent was requested and how it was phrased, and whether a warrant was obtained. Camera footage, the officer's report, and the dispatch log do not always line up, and those gaps are worth finding early.

Not every search is vulnerable; many are lawful. But whether yours was has an actual answer, worth getting before you decide how to resolve the case.

One divergence to understand. Michigan and federal law still do not line up on marijuana, and the gap hurts people who assume state legality settles everything. Marijuana remains a federally controlled substance, and 18 USC 922(g)(3) makes it an offense for an "unlawful user of or addicted to any controlled substance" to possess a firearm, with no state-legalization exception in the statute.

That provision is now sharply limited, but not gone. In United States v Hemani, 608 US ___ (2026) (Docket No. 24-1234, decided June 18, 2026), the Supreme Court held that prosecuting a marijuana user under 922(g)(3) violated the Second Amendment on that record, where the government offered no individualized showing that his drug use made him dangerous. The statute was not struck from the books. The Court left open prosecutions backed by individualized proof of dangerousness, cases involving addiction or present intoxication, and users of other drugs, and did not address exposure such as false statements on purchase paperwork. This area changed in 2026 and remains unsettled — if marijuana and firearms both figure in your life, that deserves its own conversation with a lawyer.

Talk to someone before deciding what to do

If you are facing a charge that came out of a traffic stop in Kent County or elsewhere in Michigan, the stop itself deserves a careful look. Scozzari Law, PLLC handles criminal defense matters in Grand Rapids and across West Michigan. Call us at (616) 226-4343 or email me at James.scozzari@scozzarilaw.com to set up a consultation and talk through what happened in your case.

This article is general information about Michigan law and is not legal advice. Reading it does not create an attorney-client relationship with Scozzari Law, PLLC. Michigan law changes, and how it applies depends entirely on the facts of your case. If you have a family law or criminal matter in Kent County or elsewhere in Michigan, talk to a lawyer about your specific situation.