Minnesota law requires nearly every driver and passenger to wear a seat belt, and fines them for not doing it. Minnesota law also makes the fact that they did not wear one inadmissible in the lawsuit that follows the crash.
That combination looks like an oversight. It is not. It is a deliberate evidentiary rule, it has survived a recent legislative revision of the surrounding section, and it removes from Minnesota crash litigation the single most effective damages argument available to the defense in states that allow it.
The part practitioners misstate is the direction. The bar is symmetric. It excludes proof of use just as firmly as proof of nonuse — which means a plaintiff who was properly belted and badly hurt cannot tell the jury so either.
Where is the rule, and what does it say?
Not in the statute that requires seat belts. It is in the older section next door, which is titled for a different subject entirely.
Minn. Stat. § 169.685 is headnoted “SEAT BELT; PASSENGER RESTRAINT SYSTEM FOR CHILDREN,” and most of it is about equipment standards and child restraints. Subdivision 4 is the evidentiary rule, and it is two paragraphs long:
(a) Except as provided in paragraph (b), proof of the use or failure to use seat belts or a child passenger restraint system as described in subdivision 4a, or proof of the installation or failure of installation of seat belts or a child passenger restraint system as described in subdivision 4a is not admissible in evidence in any litigation involving personal injuries or property damage resulting from the use or operation of any motor vehicle.
(b) Paragraph (a) does not affect the right of a person to bring an action for damages arising out of an incident that involves a defectively designed, manufactured, installed, or operating seat belt or child passenger restraint system. Paragraph (a) does not prohibit the introduction of evidence pertaining to the use of a seat belt or child passenger restraint system in an action described in this paragraph.
Four features of that text carry the weight.
“Use or failure to use.” Both. This is not a one-way protective rule for plaintiffs. A plaintiff cannot introduce belt use to show the crash forces were severe despite restraint, and cannot use it as a character or credibility point. The subject is simply closed.
“Or proof of the installation or failure of installation.” A separate object. A claim that the owner of an older vehicle never installed belts is also outside the record.
“Any litigation involving personal injuries or property damage.” Not “any civil action.” The scope language is written around the subject matter of the litigation rather than around a procedural category, and it reaches property damage cases as well as injury cases.
“Resulting from the use or operation of any motor vehicle.” The trigger is the vehicle, not the vehicle’s insurance status. Unlike the no-fault tort threshold — which by its terms attaches to actions arising from the use of a vehicle “with respect to which security has been provided,” as discussed in our piece on the § 65B.51 threshold — subdivision 4 contains no coverage condition at all.
Does it cover child seats too?
Yes, expressly and by name — “seat belts or a child passenger restraint system,” in both the use clause and the installation clause of paragraph (a).
“Child passenger restraint system” is defined in the same section. Subdivision 3a(c) defines it as a device that meets applicable federal motor vehicle safety standards and any other applicable federal regulations, “is designed to restrain, seat, or position children,” and “is appropriate to the age of the child being restrained” — and it says expressly that the term “includes a booster seat,” which subdivision 3a(b) separately defines.
Subdivision 4a is the substantive child-restraint mandate: rear-facing until age two or the seat’s limits, forward-facing with an internal harness after that, a booster seat and safety belt after the harness limits are exceeded, a correctly fitting safety belt from age nine or when the booster limits are exceeded, and rear seating for children under thirteen when a rear seat is available. Violating subdivision 4a is a petty misdemeanor under subdivision 5, with a fine that may be waived or reduced if the driver produces evidence that a conforming restraint was obtained within fourteen days.
None of that gets in front of the jury either. A defendant cannot prove a violation of subdivision 4a to reduce a child’s damages, because subdivision 4 bars proof of the nonuse itself. That is a significant allocation of risk: the Legislature made child restraint use mandatory and enforceable by citation, and simultaneously made it evidentially unusable in the injured child’s civil case.
What about the statute that actually requires adults to buckle up?
That is a different section, and it contains no evidentiary provision at all.
Minn. Stat. § 169.686, subd. 1(a) is the adult mandate: “Except as provided in section 169.685, a properly adjusted and fastened seat belt, including both the shoulder and lap belt when the vehicle is so equipped, must be worn by the driver and passengers of a passenger vehicle, commercial motor vehicle, type III vehicle, and type III Head Start vehicle.” Subdivision 1(a) also extends the requirement to autocycles equipped with seat belts and to class 2 all-terrain vehicles factory-equipped with seat belts when operated on or within the right-of-way of a public road.
Subdivision 1(b) sets the penalty and adds a detail worth knowing: a violation carries a fine, the driver is separately liable for each violation by the driver or by a passenger under fifteen, and “[t]he Department of Public Safety must not record a violation of this subdivision on a person’s driving record.”
Subdivision 2 lists seven exemptions from the wearing requirement — including a person driving in reverse, a person in a vehicle where every belted position is occupied, a person with a physician’s written certificate of medical unfitness or physical disability, certain frequent-stop workers traveling under 25 miles per hour, rural mail carriers and newspaper delivery persons on duty, occupants of vehicles manufactured before January 1, 1965, and people in a pickup truck engaged in normal farming work.
Read § 169.686 all the way through and you will not find an admissibility sentence. The evidentiary bar exists in one place — § 169.685, subd. 4 — and it is written broadly enough to cover nonuse of a belt required by § 169.686. That is a structural point, not a stylistic one: a lawyer who goes looking for the rule in the seat-belt-use statute will not find it.
Where does the bar stop?
At one carve-out, stated in a single paragraph, and it is narrower than it first reads.
Paragraph (b) preserves product liability claims. It “does not affect the right of a person to bring an action for damages arising out of an incident that involves a defectively designed, manufactured, installed, or operating seat belt or child passenger restraint system,” and it “does not prohibit the introduction of evidence pertaining to the use of a seat belt or child passenger restraint system in an action described in this paragraph.”
That makes sense. A crashworthiness case about a belt that unlatched cannot be tried with the belt excluded from evidence. But note what the second sentence does not say: it does not limit the reopened evidence by party or by purpose. It says evidence pertaining to seat belt use is not prohibited “in an action described in this paragraph.” Whether that opens the subject only for the claim against the manufacturer, or generally in a case that includes such a claim, is not answered by the text. A plaintiff who adds a restraint-defect claim to an ordinary crash case should understand that the addition may take the protection of paragraph (a) off the table, and should decide that deliberately rather than discover it at a motion in limine.
Two other limits are worth stating precisely.
The bar is about admissibility, not about liability. It does not say belt nonuse is irrelevant, or that it is not fault. It says proof of it is not admissible.
It does not reach helmets. Motorcycle equipment is governed by Minn. Stat. § 169.974, subd. 4(a), which requires protective headgear only for operators and riders under eighteen (and eye protection for all operators), with exceptions for permitted parades and enclosed-cab autocycles. That section contains no admissibility provision comparable to § 169.685, subd. 4. Anyone reasoning from the seat belt rule to a helmet rule is reasoning past the text.
Why this rule moves case values
Because of what it takes away from the general definition of fault.
Minn. Stat. § 604.01, subd. 1a defines “fault” for Minnesota comparative fault purposes to include, among other things, “unreasonable failure to avoid an injury or to mitigate damages.” On its face that language would let a defendant argue that a plaintiff who chose not to buckle up unreasonably failed to avoid injury, and ask the jury to reduce damages accordingly.
Section 604.01 already confines that argument once: “Evidence of unreasonable failure to avoid aggravating an injury or to mitigate damages may be considered only in determining the damages to which the claimant is entitled. It may not be considered in determining the cause of an accident.”
Section 169.685, subd. 4 confines it again, and completely, for this one fact. The defense does not get a reduced-damages instruction on belt nonuse, because it cannot put the nonuse into evidence in the first place. In a serious-injury case where the mechanism of harm is ejection or unrestrained occupant kinematics, that is the difference between a full-value verdict and a verdict cut by a percentage the jury picks. The rest of the reduction machinery — collateral sources, comparative fault, settlement credits — still applies in the fixed order Minnesota sets by statute; belt nonuse simply is not one of the inputs.
Has the Legislature revisited it?
Yes, recently — and it left the rule alone.
The Revisor’s history line for § 169.685 ends with Laws 2024, ch. 104, art. 1, §§ 40–44. Section 41 of that article amended subdivision 4. Reading the strike-and-underscore text, the changes were housekeeping: the internal cross-reference was conformed from “subdivision 5” to “subdivision 4a” because the child-restraint requirements were being renumbered into a new subdivision 4a, and “shall not be admissible” became “is not admissible.” The substance of the bar — what is excluded, from what proceedings, and the single product-liability carve-out — was not changed.
One ambiguity the 2024 amendment did not resolve, and which a careful reader should notice: the phrase “as described in subdivision 4a” appears after “seat belts or a child passenger restraint system” in both clauses of paragraph (a). Whether that phrase modifies only the child restraint term or both terms is not settled by the syntax, and the amendment simply carried the phrase forward with a new subdivision number. It is a question to brief in a case where it matters, not a question to assume away.
What to do
- Do not plead around it. Belt nonuse is inadmissible; there is no need to anticipate it in a complaint, and raising it invites the argument that the subject has been opened.
- Move in limine anyway. The bar is statutory, but adjusters, investigating officers, and medical records routinely note restraint status. Exclude the references in the exhibits, not just the argument.
- Scrub the records that will go to the jury. Crash reports and emergency department notes commonly record “restrained” or “unrestrained.” Those are the practical route by which the fact reaches a jury despite subdivision 4.
- Decide about a restraint-defect claim on purpose. Paragraph (b) reopens seat belt evidence “in an action described in this paragraph,” and the text does not say for whose benefit.
- Do not extend the rule to helmets. Section 169.974 has no analogue, and helmet nonuse in a Minnesota motorcycle case is a different problem than belt nonuse in a car case. Where the at-fault driver’s limits will not cover a motorcycle injury, the uninsured and underinsured coverage on the rider’s own policy usually matters more than the evidentiary question.
- Remember it does not touch first-party benefits. Section 169.685, subd. 4 is a rule of evidence in litigation. It does not decide what a no-fault carrier pays, or whether a benefit dispute goes to mandatory no-fault arbitration.
The observation
Legislatures usually pair a mandate with a consequence. Minnesota paired this one with a fine, a rule against recording the violation on a driving record, and an evidentiary bar that keeps the violation out of the injured person’s civil case.
The policy behind that is not hard to see. If belt nonuse were admissible, every serious crash case would become a battle over occupant kinematics, and the person who paid for that battle would be the one already injured. The Legislature decided that the way to increase seat belt use is enforcement on the road, not damages reduction in a courtroom.
What makes the rule unusual is the symmetry. A statute designed to protect injured people from a defense argument could easily have been written one way — bar proof of nonuse, permit proof of use. It was not. The word is “use or failure to use,” and the effect is that the whole subject disappears from the trial.
That is a cleaner rule than the alternative, and it is also a rule that quietly does more for the value of Minnesota crash cases than most doctrines lawyers spend far more time arguing about.
Madgett Law, LLC handles Minnesota automobile and motorcycle injury claims, including evidentiary motion practice, no-fault benefit disputes, and underinsured motorist claims. If you have been hurt in a crash, whether you were wearing a seat belt is not the question that decides your case. Send us a message or call 612-470-6529.
Sources: Minn. Stat. § 169.685 (2025) (subd. 3a(b)–(c), definitions of “booster seat” and “child passenger restraint system,” including that the latter “includes a booster seat”; subd. 4(a), the admissibility bar on proof of the use or failure to use, and the installation or failure of installation of, seat belts or a child passenger restraint system in any litigation involving personal injuries or property damage resulting from the use or operation of any motor vehicle; subd. 4(b), the product-liability carve-out and the sentence permitting seat belt evidence “in an action described in this paragraph”; subd. 4a(a)(1)–(6) and (b)–(d), the child passenger restraint requirements; subd. 5(a), petty misdemeanor and fine, with the fourteen-day purchase provision); Minn. Stat. § 169.686 (2025) (subd. 1(a), the seat belt requirement and its extension to autocycles and certain class 2 all-terrain vehicles; subd. 1(b), the fine, per-violation driver liability, and the prohibition on recording the violation on a driving record; subd. 2, clauses (1)–(7), the seven exemptions from the wearing requirement — and note that this section contains no admissibility provision); Minn. Stat. § 169.974, subd. 4(a)–(b) (2025) (protective headgear required for motorcycle operators and riders under eighteen, eye protection for all operators, and the parade and enclosed-cab autocycle exceptions — and note that § 169.974 contains no admissibility provision); Minn. Stat. § 604.01, subd. 1a (2025) (“fault” includes “unreasonable failure to avoid an injury or to mitigate damages”; the second paragraph limiting mitigation evidence to damages and forbidding its use “in determining the cause of an accident”) (Minnesota Office of the Revisor of Statutes, 2025 Minnesota Statutes). Revisor’s history line for § 169.685 (last listed amendment, Laws 2024, ch. 104, art. 1, §§ 40–44); Laws of Minnesota 2024, ch. 104, art. 1, § 41 (amending Minn. Stat. 2022, § 169.685, subd. 4 — the strike-and-underscore text on the Revisor’s site shows the cross-reference changed from “subdivision 5” to “subdivision 4a” and “shall not be” changed to “is not,” with no other change), and § 42 (adding subd. 4a). The scope of the paragraph (b) carve-out as to party and purpose, and whether the phrase “as described in subdivision 4a” modifies “seat belts” as well as “child passenger restraint system,” are identified above as open questions of construction and are not answered here; no Minnesota appellate decision construing § 169.685, subd. 4 is cited or relied upon in this article. This article is general legal information about Minnesota law, not legal advice, and reading it does not create an attorney–client relationship. Every case depends on its own facts. No outcome is promised or implied.