In United States v. Martin, 173 F.4th 110 (4th Cir. 2026), the court held that an officer exceeded the permissible scope of a traffic stop when he almost immediately shifted his attention from the traffic violation to questioning the occupants about firearms.
The case illustrates a law enforcement practice—deviating from or expanding the original investigation—that can arise at different points in a traffic stop. In Martin, the problem was that the officer effectively abandoned the traffic mission near the beginning of the stop. In a federal criminal case I handled several years ago, United States v. Michael Earl Jones, No. 3:19-cr-00965 (D.S.C.), the problem came at the other end. The officer had completed the traffic stop but continued detaining the driver to investigate drugs. The facts were different, but the Fourth Amendment problem was much the same.
In Martin, the defendant was a passenger in a vehicle traveling through the Monongahela National Forest in West Virginia. A Forest Service officer first encountered Martin and the driver, Melisa Jarvis, when their vehicle was pulled off the road. About 45 minutes later, the officer encountered them again, this time parked on a single-lane bridge. Jarvis moved the vehicle off the bridge, and the officer initiated a traffic stop for illegally parking there.
After briefly explaining the reason for the stop, however, the officer immediately asked whether there were firearms in the vehicle. Jarvis acknowledged that there were. The officer continued asking about firearms and whether there was anything else in the vehicle. Eventually, a second firearm was discovered under the passenger seat. A records check revealed that Martin had prior felony convictions, and he was later indicted for being a felon in possession of a firearm.
Martin moved to suppress the firearm and his statements. The district court denied the motion, and Martin entered a conditional guilty plea that allowed him to appeal the Fourth Amendment issue.
The Fourth Circuit reversed based on long-established Fourth Amendment principles. The Supreme Court has held that the permissible duration and scope of a traffic stop, a seizure under the Fourth Amendment, are tied to its “mission,” meaning the traffic violation and the ordinary tasks associated with it, such as checking a driver’s license, registration, insurance, and outstanding warrants.
That does not mean an officer can never ask about something else. But unrelated questioning cannot measurably extend the stop, and an officer cannot use a traffic violation as an excuse for an unrelated criminal investigation (i.e. a “fishing expedition”) without some independent justification.
That was the problem in Martin. The Fourth Circuit emphasized that the vehicle had already moved from the bridge before the officer initiated the stop. More importantly, after briefly mentioning the parking violation, the officer “raced to question” the occupants about firearms and other potential contraband. He never meaningfully returned to the reason for the stop and ultimately issued no traffic citation.
The court also rejected the government’s argument that the firearms questions were justified by officer safety. The stop occurred during the day, neither occupant behaved suspiciously, and the officer’s own conduct suggested that he did not consider Martin or Jarvis particularly dangerous.
The majority concluded that the officer had “abandoned the mission of the stop.” It reversed the denial of Martin’s suppression motion and vacated his guilty plea.
The issue arose somewhat differently in the case I handled, United States v. Jones. A South Carolina Highway Patrol trooper stopped Jones on Interstate 20 for following another vehicle too closely. During the stop, the trooper asked Jones a long series of questions unrelated to following too closely, including questions about his travel, medications, illegal drugs, and whether he was carrying large amounts of currency. At one point Jones himself asked, “Sir, you’re stalling me, please, can I go?”
Eventually the trooper completed a warning ticket, explained that it carried no points or fine, and then began handing it to Jones. At that precise moment, the trooper asked for permission to search the vehicle. Jones said no. The trooper then pulled the warning ticket (which he’d never let go of) back out of Jones’s hand, held it up, and told him, “I’ll give it back to you in a minute,” while a drug dog was walked around the vehicle. The dog alerted, officers searched the vehicle, and Jones was charged federally with possessing with intent to distribute 500 grams or more of methamphetamine in violation of 21 U.S.C. § 841(b)(1)(A). Because of a prior drug conviction, Mr. Jones faced 15 years to life in prison. We moved to suppress the evidence.
At the suppression hearing, the dash cam and body cam videos became particularly important. The government relied in part on the trooper’s description of Jones as unusually nervous, pointing to his posture, breathing, lack of eye contact and other observations. On cross-examination, I went through portions of the video with the trooper and challenged whether those behaviors could actually be seen. We argued that the body-camera footage allowed the Court to see Jones’s expression, breathing, and movements for itself, and that the video simply did not match the description of an unusually nervous driver.
The Court agreed. After reviewing the dash-camera and body-camera footage, it found that the claimed signs of nervousness had been “overstated” and that Jones appeared “relatively calm and collected throughout the stop.”
Most importantly, the trooper conceded on cross-examination that all of the steps necessary to issue the warning had been completed before the dog sniff. The Court found that the stop had been extended by approximately five to seven minutes and that the trooper lacked reasonable suspicion to justify that additional detention. The motion to suppress was granted, and the government subsequently dismissed the charges.
Martin and Jones arose at opposite ends of a traffic stop, but the lesson is much the same. A valid reason to stop a vehicle does not give law enforcement an open-ended opportunity to investigate its occupants. There is a point at which an officer strays too far from the reason for the stop, and there is a point at which the stop is simply over.
For defense lawyers, that is why the details matter. Not just what an officer says happened, but what happened in what order, what questions were asked, what questions were not asked, and, more and more often, what the video actually shows.
Disclaimer: This case summary is provided for informational purposes only and does not constitute legal advice. Artificial intelligence tools may have been used to assist in researching, drafting, or editing this article; all content has been reviewed by an attorney before publication. Polales Horton & Leonardi LLP is experienced in handling a wide variety of civil and criminal cases in state and federal courts. To discuss your case, please contact Dan Leonardi through his email.
