Are DUI checkpoints legal in Pennsylvania?
Yes, within limits. The U.S. Supreme Court approved properly run sobriety checkpoints in 1990, in Michigan Department of State Police v. Sitz. Pennsylvania's own constitution protects privacy more strongly in some areas, so the state's courts set their own rules. In Commonwealth v. Tarbert (1987), a plurality of the Pennsylvania Supreme Court said checkpoints can be constitutional if they follow specific safeguards. In Commonwealth v. Blouse (1992), the Court adopted those safeguards.
The Vehicle Code also lets officers stop vehicles as part of a systematic program of checking vehicles or drivers, under 75 Pa.C.S. § 6308(b).
The five Tarbert and Blouse requirements
Pennsylvania courts describe the requirements this way:
- The stop must be brief and must not involve a physical search of the vehicle or the people in it.
- There must be enough warning that the checkpoint exists, so drivers aren't surprised.
- The decision to hold the checkpoint, and its time and place, must be approved in advance by supervisors, not chosen by officers in the field.
- The time and place must be based on local experience about where and when impaired drivers are likely to be on the road.
- Which vehicles get stopped must follow objective rules set in advance, such as every car or every third car, not an officer's choice at the scene.
Courts require substantial compliance, not perfection. But when police don't meet these requirements, courts can suppress the evidence from the stop, which can include field sobriety and chemical test results.
What these rules look like in a real case
Checkpoint cases often come down to paperwork. The defense can ask for the written approval, the operational plan, the data used to choose the location and time, and the rule for which cars to stop. If the department can't show why it picked that road at that hour, or officers stopped or waved through cars without a set rule, those are issues worth raising.
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Checkpoints in the counties we serve
Local police departments and the Pennsylvania State Police run sobriety checkpoints and roving DUI patrols across the counties we serve: Delaware, Chester, Montgomery, Bucks, Berks and Lancaster. Many are announced in advance through the police department or local news, often without the exact location, and enforcement tends to increase around holidays. We don't list specific checkpoint dates here, because they change and an old list can mislead you.
If you are arrested at a checkpoint, the case follows the same path as any other DUI: a preliminary hearing before the local magisterial district judge and, if the case moves forward, the county Court of Common Pleas.
Checkpoints versus roving patrols
A roving DUI patrol is different from a checkpoint. On a roving patrol, officers stop a car only after seeing a traffic violation or something else that gives them reasonable suspicion. The Tarbert and Blouse rules apply to checkpoints, while a roving patrol stop is judged like any other traffic stop.
What you have to do at a checkpoint
- Stop when directed and follow lawful instructions.
- Show your driver's license, registration and proof of insurance when asked.
- Stay calm and keep your hands where the officer can see them.
What you can decline
- Questions about your evening. You can politely decline to answer questions about where you've been or whether you've been drinking.
- Field sobriety tests. They are not chemical tests under the implied consent law, so declining them is not a refusal that triggers a PennDOT suspension. The officer can still decide whether to arrest you based on what they observe.
- The roadside preliminary breath test. Refusing it does not count as a refusal for license suspension purposes under § 1547(k).
- A search of your car. You can say you don't consent. Under Commonwealth v. Alexander (2020), a warrantless car search in Pennsylvania generally requires both probable cause and exigent circumstances.
A chemical test after an arrest is different. Refusing a breath or blood test at that stage triggers a license suspension and can increase the criminal penalties. See refusing a breath or blood test in PA before you assume refusing is the safer choice.
When a checkpoint stop becomes a DUI investigation
If an officer believes they see signs of impairment, such as the odor of alcohol, slurred speech or fumbling with documents, you may be directed to a separate area for more questions and field sobriety tests. At that point the brief checkpoint stop has become a DUI investigation. The officer needs reasonable suspicion to hold you longer and probable cause to arrest you, and both can be challenged later.
Can you turn around before a checkpoint?
Legally turning away before you reach a checkpoint is not a crime by itself. But if you make an illegal turn, cross a line or commit another traffic violation while doing it, officers can stop you for that. Whether simply avoiding a checkpoint is enough to justify a stop depends on the facts.
If you were arrested at a checkpoint
- Write down the location, the time, how the checkpoint was marked and lit, and how cars were being chosen.
- Note how long you were held before an officer said they saw signs of impairment.
- Keep all paperwork and any letters from PennDOT.
- Talk to a DUI defense lawyer early, so requests for the checkpoint records can go out quickly.
For the rest of the process, see our Pennsylvania DUI defense guide, our first offense DUI page and our page on DUI blood tests and the two-hour rule.
This page is general information, not legal advice.
Prior results do not guarantee a similar outcome. Pennsylvania DUI law changes often, and this page reflects the law as of October 2026. Every case depends on its own facts.