DUI Checkpoints
DUI Checkpoints in Pennsylvania.
A sobriety checkpoint is a warrantless seizure of every driver who passes through. It's only constitutional if it meets a specific list of requirements from Commonwealth v. Tarbert and Commonwealth v. Blouse. Miss one, and the stop — and every piece of evidence that follows — gets suppressed.
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The Tarbert / Blouse five.
Pennsylvania checkpoints must satisfy every one of five requirements — the state bears the burden at any suppression hearing. If even one is missing or poorly documented, the stop is unconstitutional and the case usually collapses.
Supervisory authorization
Written authorization from a police supervisor identifying the checkpoint's date, time, location, and operational plan.
Prior-arrest data supports the location
The location must be selected based on documented history of DUI-related incidents in the area — not chosen arbitrarily.
Advance publicity
The public must be notified in advance — typically a press release to local news 24–72 hours before the checkpoint operates.
Neutral stopping formula
Officers must stop cars using a pre-set, non-discretionary rule (every car, every third car). Officer discretion in who to stop makes the checkpoint unconstitutional.
Minimal intrusion & safety
Uniformed officers, marked cruisers, adequate signage and lighting. Each stop is limited to a brief screening for signs of impairment.
Your rights at the checkpoint.
You must produce license, registration, and insurance. That's it. You are not required to answer questions about where you've been, whether you've been drinking, or how much. The roadside preliminary breath test (PBT) is voluntary and refusing it carries no penalty. If asked to step out for field sobriety testing, you can decline — though officers will likely arrest you and take you for evidentiary chemical testing.
Turning around is not a crime.
A lawful U-turn or turnoff before the checkpoint does not create reasonable suspicion for a stop. Police can only pursue if you commit an independent traffic violation — crossing a double yellow, illegal U-turn, failure to signal. If you were stopped only because you turned around, that stop is suppressible on Fourth Amendment grounds.
How checkpoint challenges win.
- · No written supervisory authorization produced
- · Location chosen without prior-arrest data
- · Press release absent, late, or wrong location
- · Officers deviating from the neutral stopping formula
- · Inadequate signage, lighting, or unmarked cruisers
- · Detention beyond a brief screening
- · Improper turnoff pursuit — no independent violation
- · PBT results treated as evidentiary
See our deep dive on PA checkpoint law for the case-law citations and hearing strategy.
FAQ
Frequently asked questions.
Common questions about Pennsylvania DUI checkpoints — legality, your rights, PBTs, and how to challenge the stop.
Yes, if they meet the constitutional requirements set out in Commonwealth v. Tarbert (Pa. 1987) and Commonwealth v. Blouse (Pa. 1992). Checkpoints must be authorized by supervisory police, publicized in advance, use a neutral stopping formula (every car, every 3rd car), be conducted with minimal intrusion, and be based on prior DUI-arrest data in the area. Miss any one of these and the stop is unconstitutional.
Yes — if the U-turn or turnoff is lawful. Turning around before reaching the checkpoint is not itself a crime and does not create reasonable suspicion. Police can only stop you if you commit an independent traffic violation while turning off (illegal U-turn, crossing double lines, failure to signal).
You must provide license, registration, and insurance. Beyond that, you have the right to remain silent — including refusing to answer 'have you had anything to drink tonight?' Answering that question truthfully is often the start of a DUI arrest. Politely decline and ask if you're free to go.
The roadside preliminary breath test (PBT) at the checkpoint is voluntary — refusing it carries no penalty. But once you're arrested for DUI and taken to the station or hospital, the evidentiary breath or blood test is covered by implied consent. Refusing there triggers a 12-month PennDOT suspension.
Yes. Under Tarbert, checkpoints must be publicized — typically through a press release to local media 24–72 hours in advance. Police must also post signage at the checkpoint and use uniformed officers with marked cruisers. The advance-publicity requirement is one of the most common grounds to challenge checkpoint stops.
Yes, if the checkpoint failed any of the Tarbert/Blouse requirements. Common defects: no supervisory authorization memo, no advance publicity, no neutral stopping formula, no prior-arrest data supporting the location, poor signage, or unmarked cruisers. A successful challenge suppresses everything obtained at the stop.
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Criminal defense
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