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Are DUI Checkpoints Legal? What the Courts Held in 9 States

Written from primary sources · Editor-reviewed · Law current as of 2026-10-26
By the duistatelaws.com editorial team · Published 2026-09-19 · Last reviewed 2026-10-26 · 13 min read
11 primary sources cited on this page. How we verify our legal content
Checkpoint operations are governed by rules set before the first car is stopped.

Key takeaways

  • Sitz (1990) upheld sobriety checkpoints under the Fourth Amendment on a balancing test, not as a blanket authorisation.
  • Edmond (2000) drew the line: a checkpoint run primarily for general crime control is unconstitutional, even though a sobriety checkpoint is not.
  • Minnesota says no under its own constitution (Ascher, 1994). Washington struck down Seattle's program because nothing gave it the “authority of law” its constitution requires (Mesiani, 1988).
  • The remaining seven give three answers: only with statewide authorisation (Texas, which the court did not find); yes, within conditions (California, Georgia, Florida, Virginia, Colorado); and not without guidelines (Arizona, 1983).
  • California enumerates eight guidelines; Georgia five conditions; Florida requires the written guidelines to exist before the checkpoint runs.
  • A checkpoint challenge is documentary. It asks for the plan, the formula, the notice and the authorisation, and compares them against what happened.

A sobriety checkpoint — a DUI checkpoint, or in Texas a DWI roadblock — is the one traffic stop that happens without any suspicion about the driver at all. That is why it is governed by rules written before the first car arrives, and why a challenge to one is about paperwork rather than about what the driver remembers.

This page quotes what the courts actually held. Every case below was read in full from the official reporter, on the date shown against it in the sources, and every quotation is the court’s own sentence. Where a page on the internet tells you how many states ban checkpoints, ask it for a citation; this one names only the states whose high court it has read, and the last section says why.

Under the federal Constitution, yes, within limits: the Supreme Court held in Sitz (1990) that a properly run sobriety checkpoint is a reasonable seizure, and in Edmond (2000) that a checkpoint run mainly to catch ordinary crime is not. Under a state’s own constitution, the answer can be no. Of the 9 states whose high courts were read for this page:

  • No, under the state constitution — Minnesota, where the Supreme Court held that temporary sobriety roadblocks violate article I, section 10 of the state constitution.
  • Not without authority from outside the police department — Washington, where the Supreme Court found Seattle’s program illegal “based on adequate and independent state grounds” because nothing gave it the “authority of law” the state constitution requires; and Texas, where the Court of Criminal Appeals held that Sitz requires a DWI roadblock program to be authorized by a statewide governing body, and found no such authorisation.
  • Yes, within conditions — California, Georgia, Florida and Virginia, each with its own test, and Colorado, which applies the Sitz balancing test as written; all in the table below.
  • Not without guidelines — Arizona, whose 1983 decision struck down roadblocks run without specific directions or guidelines.

That is a statement about nine states and nine opinions, not about the country; South Carolina, the tenth state this site covers in depth, is not in it because the candidate decision found could not be opened.

The two Supreme Court cases that set the outer limits

Everything a state does with checkpoints happens between two federal decisions. One made them possible; the other said how far the idea can be stretched.

Sitz (1990) — what the Court actually held

Michigan Department of State Police v. Sitz is the case that made sobriety checkpoints possible, and it is routinely described as though the Court blessed them outright. It did not. It accepted that stopping a car at a checkpoint is a seizure under the Fourth Amendment, then weighed the state’s interest against the intrusion and found the balance came out in the state’s favour.

We hold that it does not and therefore reverse the contrary holding of the Court of Appeals of Michigan.

— Michigan Department of State Police v. Sitz, 496 U.S. 444 (1990)

The distinction matters because a balance can be struck differently on different facts. The rules the states built afterwards are all attempts to keep the intrusion on the side of the scale where Sitz left it.

Edmond (2000) — the line the Court would not cross

Ten years later Indianapolis ran checkpoints to interdict drugs and argued that Sitz covered them. The Court disagreed, and the sentence it used is the one that keeps sobriety checkpoints narrow.

We decline to suspend the usual requirement of individualized suspicion where the police seek to employ a checkpoint primarily for the ordinary enterprise of investigating crimes.

— City of Indianapolis v. Edmond, 531 U.S. 32 (2000)

The operative idea is primary purpose. A checkpoint aimed at highway safety is measured by Sitz; a checkpoint aimed at ordinary crime detection is not, and needs individualised suspicion like any other stop. That is why checkpoint authorisations and operational plans are written in the language of impaired driving, and why what officers were told the checkpoint was for is a live question in a challenge.

What each state adds on top

Federal law is the floor, not the whole answer. A state’s own constitution can protect drivers more than the Fourth Amendment does — Washington’s court said its article 1, section 7 “provides greater protection to individual privacy interests than the Fourth Amendment”. Each state’s own high court has been asked the same question and has answered it differently — and the difference decides what a defense actually argues about.

State What its high court requires Why it changes the case
Texas Statewide authorisation first
Holt v. State, 887 S.W.2d 16 (Tex. Crim. App. 1994)		 A checkpoint is not constitutional unless a politically accountable body at state level has authorized the program. Decided under the Fourth Amendment; the court expressly did not reach the Texas Constitution.
California Eight functional guidelines
Ingersoll v. Palmer, 43 Cal. 3d 1321 (1987)		 Permissible within limits, and the limits are enumerated. The eight are in the table below.
Georgia Five conditions
Lafontaine v. State, 269 Ga. 251 (1998)		 Supervisory decision, every vehicle stopped, minimal delay, plainly identified as a police checkpoint, and a screening officer qualified to make the initial call.
Florida Written guidelines, in advance
State v. Jones, 483 So. 2d 433 (Fla. 1986)		 The guidelines have to exist on paper before the checkpoint runs and cover vehicle selection, detention technique, duty assignments and disposition of vehicles.
Colorado The Sitz balancing test, applied directly
People v. Rister, 803 P.2d 483 (Colo. 1990)		 Colorado did not add a state-law overlay; it ran the federal balancing test and upheld the stop in front of it.
Arizona No unguided discretion
State ex rel. Ekstrom v. Justice Court, 136 Ariz. 1 (1983)		 Roadblocks run “without specific directions or guidelines” failed. Note the date: this is 1983, seven years before Sitz.
Virginia A plan with neutral criteria
Lowe v. Commonwealth, 230 Va. 346 (1985)		 Upheld Charlottesville’s roadblock because it was safe and objective, used neutral criteria and left no standardless discretion to the officer in the field. Also 1985, before Sitz.
Washington No checkpoint without “authority of law”
City of Seattle v. Mesiani, 110 Wash. 2d 454 (1988)		 Seattle’s program violated article 1, section 7 because nothing gave it the “authority of law” that provision requires; decided on independent state grounds. Three concurring justices said it was not authorized by statute or ordinance. 1988, before Sitz, but the state-constitution holding does not rest on the federal one.
Minnesota Unconstitutional under the state constitution
Ascher v. Commissioner of Public Safety, 519 N.W.2d 183 (Minn. 1994)		 Decided in 1994, four years after Sitz: the state had not justified temporary roadblocks, and they violate article I, section 10 of the Minnesota Constitution.

The four models

Seven of the nine fall into four shapes; Colorado and Arizona, taken separately below, fit none of them.

State constitution first. Washington and Minnesota decided the question under their own constitutions, which is why Sitz does not settle it there. Washington’s court said so at the outset:

We find the sobriety checkpoint program illegal based on adequate and independent state grounds.

— City of Seattle v. Mesiani, 110 Wash. 2d 454 (1988)

The provision it relied on is article 1, section 7: “No person shall be disturbed in his private affairs, or his home invaded, without authority of law.” Because a checkpoint stop is a seizure, the court said, it is “valid only if there is ‘authority of law’”, and no argument brought Seattle’s program within any interpretation of that phrase. Three concurring justices put the point more narrowly: the program failed because it “was not authorized by either statute or ordinance”, and whether to authorize one “is a legislative question”. Mesiani was decided in 1988, two years before Sitz, and also found a Fourth Amendment violation; it is the state-constitution holding, not the federal one, that Sitz does not reach.

Minnesota went further, four years after Sitz and with Sitz in front of it:

We hold that it has not met its burden and that such roadblocks violate Minn. Const. art. I, § 10.

— Ascher v. Commissioner of Public Safety, 519 N.W.2d 183 (Minn. 1994)

The Minnesota court put the burden on the state to justify the roadblock and found it had not been met. Two justices dissented.

Authorisation-first. Texas is the outlier. The Court of Criminal Appeals read Sitz as requiring that the program itself be authorized at state level before any individual checkpoint can be assessed.

The issue we are truly faced with in the instant case is whether, in light of Sitz, DWI roadblocks are constitutional without express authorization and implementation by a statewide governing body. We hold here that Sitz does so require.

— Holt v. State, 887 S.W.2d 16 (Tex. Crim. App. 1994)

One detail from that opinion is worth keeping straight, because it is frequently reported the other way round. Holt was decided under the Fourth Amendment, not the Texas Constitution. The court said so in terms: “Because we decide this case under the Fourth Amendment to the United States Constitution, we need not address appellee’s contentions regarding Article I, Section 9 of the Texas Constitution.” If you are reading a case, that is the difference between a federal argument and a state one.

Enumerated conditions. California and Georgia both list what a lawful checkpoint looks like, and both put the first condition in the same place: the decision belongs to supervisors, not to the officer on the line. Virginia, earlier than either, upheld a roadblock on a closely related ground — the plan’s neutral criteria, not the officer in the field, decided who was stopped:

The Charlottesville system is safe and objective in its operation, employs neutral criteria, and does not involve standardless, unbridled discretion by the police officer in the field, which was condemned in Prouse.

— Lowe v. Commonwealth, 230 Va. 346 (1985)

Documentary. Florida’s requirement is that the guidelines exist, in writing, in advance.

Written guidelines should cover in detail the procedures which field officers are to follow at the roadblock. Ideally, these guidelines should set out with reasonable specificity procedures regarding the selection of vehicles, detention techniques, duty assignments, and the disposition of vehicles.

— State v. Jones, 483 So. 2d 433 (Fla. 1986)

Colorado and Arizona, and why their dates matter

Colorado did not build a state-law overlay at all. It applied the federal test as written.

Applying the balancing test for checkpoint stops as enunciated in Sitz, we conclude that the checkpoint stop of the defendant was not an “unreasonable” seizure under the fourth amendment.

— People v. Rister, 803 P.2d 483 (Colo. 1990)

Arizona is the one that needs a date attached. Ekstrom was decided in 1983 — seven years before Sitz. It struck down roadblocks that were “operated without specific directions or guidelines”, and the reason it gave is the reason every later state test starts with supervisory planning:

We find present in the Kingman operation the grave danger that such discretion might be abused by the officer in the field

— State ex rel. Ekstrom v. Justice Court, 136 Ariz. 1 (1983)

What Ekstrom is authority for is that unguided discretion fails. It is not authority for the proposition that Arizona bans checkpoints, and it could not be — it predates the federal case that the whole question now runs through.

California’s eight factors, in the court’s own words

Ingersoll is the most useful of the nine for a reader anywhere, because it is the most explicit. The court set out 8 functional guidelines, lettered A to H, and later state decisions borrow from them freely.

We conclude that within certain limitations a sobriety checkpoint may be operated in a manner consistent with the federal and state Constitutions.

— Ingersoll v. Palmer, 43 Cal. 3d 1321 (1987)

Guideline, in the court’s words What it means on the night
A Decisionmaking at the Supervisory Level The decision to establish a checkpoint, the site, and the procedures are set by supervisory personnel — “and not by an officer in the field.”
B Limits on Discretion of Field Officers A neutral formula — “every driver or every third, fifth or tenth driver” — rather than an officer choosing who to stop.
C Maintenance of Safety Conditions Lighting, warning signs and signals, and clearly identifiable official vehicles and personnel.
D Reasonable Location Sites chosen by policy-making officials, on roads with a high incidence of alcohol-related accidents or arrests.
E Time and Duration When the checkpoint runs and for how long bears on both its intrusiveness and its effectiveness.
F Indicia of Official Nature of Roadblock High visibility: warning signs, flashing lights, adequate lighting, police vehicles and uniformed officers.
G Length and Nature of Detention Each motorist detained only long enough for the brief screening the stop is for.
H Advance Publicity Publicity “both reduces the intrusiveness of the stop and increases the deterrent effect of the roadblock.”

Two of those do more work than the rest in an actual challenge. B is the one that produces records — a neutral formula either was written down and followed or it was not. H is the one drivers are most surprised by: advance publicity is a legal requirement rather than a courtesy, because publicising the checkpoint is part of what makes the stop less intrusive.

Georgia’s five, for comparison

Georgia’s list is shorter and arrives at much the same place. The Supreme Court of Georgia treated a roadblock as satisfactory where:

the decision to implement the roadblock was made by supervisory personnel rather than the officers in the field; all vehicles are stopped as opposed to random vehicle stops; the delay to motorists is minimal; the roadblock operation is well identified as a police checkpoint; and the “screening” officer’s training and experience is sufficient to qualify him to make an initial determination as to which motorists should be given field tests for intoxication

— Lafontaine v. State, 269 Ga. 251 (1998)

The fifth condition is the one with no California counterpart — Georgia asks specifically about the screening officer’s training, which makes that officer’s qualifications a document a defense can ask for.

Turning away from a checkpoint

Drivers ask whether avoiding a checkpoint is itself a reason to be stopped. The honest answer is that it depends on how the avoidance was accomplished, and that the cases turn on the manner rather than the intent.

A lawful turn at a lawful place is a lawful turn. What creates a reason to stop is a traffic violation committed in the course of avoiding — an illegal U-turn, crossing a solid line, cutting through a closed lot. The avoidance is not the offence; the violation used to accomplish it is. And once a car is stopped for that violation, the stop is an ordinary one supported by ordinary observations, which puts it outside the checkpoint rules entirely.

This is state law and it varies. The pages linked in the table above carry each state’s own statutes; none of the nine opinions read for this page decides the avoidance question, so this page does not state a rule for it.

What a checkpoint challenge actually asks for

Because the rules are about planning, the challenge is about documents. That makes a checkpoint case unlike a roadside stop case, where the argument is about what an officer saw.

Document What it is being tested against
The authorisation Whether a supervisor, and in Texas a state-level body, approved the program
The operational plan Location, time, duration, staffing — the factors California letters D and E
The selection formula Whether “every car” or “every nth car” was set in advance and actually followed
The publicity Whether notice went out before the checkpoint ran
The screening officer’s training record Georgia’s fifth condition, and useful anywhere
The stated purpose Edmond: highway safety, or general crime control

None of those is something the driver can produce. All of them are things the agency either has or does not, which is why the first substantive step in a checkpoint case is a request for them, and why the answer often arrives before any argument about the driving.

If the stop ended in a breath or blood test, a second and separate proceeding is already running against the license — see refusing a breathalyzer for what implied consent costs, and DUI law by state for each state’s deadline to demand a hearing. If you are trying to work out which court and which statute apply at all, the DUI lawyer hub opens with the terminology table.

What this page does not say, and why

An earlier version of this page stated that twelve states do not run sobriety checkpoints, listed them, said that three more require prior judicial approval, and gave a count of states that permit them as of a particular month. Those claims have been removed. None of them could be traced to a primary source from this desk, and a count of that kind is exactly the sort of number that gets copied between websites until nobody can say where it started.

What is here instead is nine states, each with the opinion that decides the question, each quoted, each linked to the full text of the official reporter. Two of them decided the question under the state constitution — Minnesota holds temporary sobriety roadblocks unconstitutional, and Washington struck down Seattle’s program for want of “authority of law” — and that is now said, because the opinions say it. That is still a smaller claim than a national count, and a checkable one. South Carolina was attempted for this revision; its candidate decision sits on the state court’s own site, which refused this host, so South Carolina is not in the table. The remaining states will be added as their high courts’ decisions are read, not before.

Three further limits worth stating plainly. First, a state’s position can change — these are judicial decisions, and the most recent of the nine is from 1998. Second, a later statute or constitutional amendment can change the answer, and this page reads the decisions, not every later act. Third, the federal cases govern the floor but not the practice: a state may permit checkpoints and still have agencies that do not run them.

Sources

Every opinion was retrieved in full text from the Caselaw Access Project’s mirror of the official reporters, on the date shown against it. CourtListener, Justia and FindLaw all refused requests from this host; the citation given is the bound reporter, and the link is the document that was actually opened.

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