DUI checkpoints allow California law enforcement officers to briefly stop drivers without the individualized suspicion normally required for a traffic stop. However, sobriety checkpoints are not unlimited. Constitutional safeguards govern how checkpoints are selected and operated, and drivers retain important rights during the encounter.
The California Supreme Court has upheld properly conducted sobriety checkpoints as a method of deterring impaired driving. The legality of a particular checkpoint depends on the circumstances under which it was planned and operated.
If you are arrested for DUI at a checkpoint, the fact that the arrest occurred at a roadblock does not prevent you from challenging the checkpoint, the officer’s subsequent investigation, or the evidence against you.
Are DUI Checkpoints Legal in California?
Yes.
The California Supreme Court addressed sobriety checkpoints in Ingersoll v. Palmer and identified several factors designed to minimize the intrusion on drivers and limit arbitrary police action.
The United States Supreme Court subsequently upheld properly conducted sobriety checkpoints under the Fourth Amendment.
However, that does not mean every checkpoint or every detention occurring at one is automatically lawful.
What Makes a California DUI Checkpoint Lawful?
California courts have identified several factors relevant to determining whether a sobriety checkpoint is reasonable.
These include:
- Decision-making by supervisory law enforcement personnel rather than officers in the field
- Neutral criteria for deciding which vehicles will be stopped
- A reasonable checkpoint location
- Consideration of safety for motorists and officers
- Reasonable timing and duration
- Clear indications that the checkpoint is an official law enforcement operation
- Minimizing the length and intrusiveness of the detention
- Advance publicity as a factor that can reduce surprise and increase the checkpoint’s deterrent effect
These factors are used to evaluate the overall reasonableness of the checkpoint rather than as a mechanical checklist under which the absence of any single factor automatically makes the checkpoint unconstitutional.
Does Police Have to Announce a DUI Checkpoint in Advance?
Not as a constitutional requirement.
The California Supreme Court originally discussed advance publicity as an important safeguard in Ingersoll v. Palmer.
The court later clarified in People v. Banks that advance publicity is not a constitutional prerequisite to a valid sobriety checkpoint.
Advance publicity can still be relevant when evaluating the overall reasonableness of a checkpoint, and law enforcement agencies may have their own policies concerning publicity.
For example, current California Highway Patrol procedures call for advance publicity of CHP sobriety checkpoints as a means of reducing intrusiveness and increasing deterrence.
Therefore, the fact that you did not personally see or hear an announcement about a checkpoint does not, by itself, make the checkpoint illegal.
Can Police Stop Every Car at a DUI Checkpoint?
A checkpoint must use neutral criteria for determining which vehicles are stopped.
Depending on the checkpoint plan, officers might stop every vehicle, every third vehicle, every fifth vehicle, or use another predetermined neutral pattern.
What officers generally cannot do is simply choose which motorists to stop based on an individual officer’s unchecked discretion.
The selection procedure should be established as part of the checkpoint operation rather than allowing officers in the field to arbitrarily decide which drivers appear worth investigating.
What Happens When You Reach a DUI Checkpoint?
The initial checkpoint detention should generally be brief.
An officer may speak with the driver and observe whether there are signs that could indicate impairment.
Officers may look for evidence such as:
- Odor of alcohol
- Slurred speech
- Bloodshot or watery eyes
- Difficulty responding to questions
- Open containers or other evidence visible from a lawful vantage point
- Other observable signs suggesting possible impairment
If the officer observes no indication requiring additional investigation, the driver should ordinarily be allowed to proceed without unnecessary delay.
If the officer develops sufficient grounds for further investigation, the driver may be directed to a secondary screening area.
Can a DUI Checkpoint Turn Into a DUI Investigation?
Yes.
The checkpoint itself provides the basis for the initial brief stop when it is lawfully conducted.
But extending the encounter into a more substantial DUI investigation generally requires additional justification based on what the officer observes during the initial contact.
For example, observations suggesting alcohol or drug impairment may lead to further questioning, field sobriety tests, a preliminary alcohol screening test, or other investigative steps.
If the investigation results in an arrest, the legality of both the checkpoint and the officer’s subsequent actions may become relevant to the defense.
Do You Have to Answer Questions at a DUI Checkpoint?
Drivers should comply with lawful orders and provide documents that California law requires them to provide, such as a driver’s license and other required driving documentation.
That does not mean a driver must volunteer potentially incriminating information.
Questions such as where you were, where you are going, or how much you have had to drink can become part of a later DUI investigation.
A driver should not lie to an officer, but the right to remain silent does not disappear simply because the encounter occurs at a checkpoint.
Can You Turn Around to Avoid a DUI Checkpoint?
The fact that a driver chooses not to enter a checkpoint does not automatically establish reasonable suspicion that the driver is intoxicated.
In Ingersoll, the checkpoint procedures specifically provided that motorists were not to be stopped merely because they chose to avoid the checkpoint.
However, a driver who turns away must still obey traffic laws.
An illegal U-turn, unsafe maneuver, equipment violation, or other independently observed violation can provide police with a separate reason to initiate a traffic stop.
Attempting to avoid a checkpoint therefore does not give a driver permission to violate the Vehicle Code.
Do You Have to Perform Field Sobriety Tests?
Field sobriety tests may be requested when an officer suspects impairment.
These tests can include exercises intended to evaluate balance, coordination, divided attention, and other observations.
The legal rules concerning field sobriety testing, preliminary roadside alcohol screening, and post-arrest chemical testing are not identical.
Drivers should also understand that California’s implied-consent requirements concerning chemical testing generally arise after a lawful DUI arrest and should not simply be treated as interchangeable with every roadside test requested during an investigation.
Can Police Search Your Vehicle at a DUI Checkpoint?
The existence of a DUI checkpoint does not automatically give police unlimited authority to search every vehicle passing through it.
A vehicle search must have an independent lawful basis.
Depending on the circumstances, that could involve consent, probable cause, evidence observed in plain view, an arrest combined with an applicable search doctrine, or another legally recognized basis for the search.
A driver may decline a request for consent to search when police do not otherwise have legal authority to conduct the search.
What If You Are Arrested for DUI at a Checkpoint?
A checkpoint arrest can still be challenged.
Potential issues may include:
- Whether the checkpoint was properly authorized
- Whether neutral criteria were used to select vehicles
- Whether the initial detention was unnecessarily prolonged
- Whether officers had sufficient grounds to extend the encounter into a DUI investigation
- Whether there was probable cause for the arrest
- Whether field sobriety tests were properly administered and interpreted
- Whether breath or blood testing procedures were properly followed
- Whether statements or other evidence were obtained lawfully
The fact that an arrest occurred at a checkpoint does not establish that the prosecution can prove the DUI charge.
What Happens to Your Driver’s License After a Checkpoint DUI Arrest?
A qualifying DUI arrest can also result in a separate California DMV proceeding involving your driving privilege.
The DMV matter is different from the criminal prosecution.
A driver generally has only 10 days after receiving an Order of Suspension or Revocation to request a DMV administrative hearing challenging the action.
For more information, read our guide to California DMV DUI hearings.
What Should You Do After a DUI Checkpoint Arrest?
Keep all documents you received, note the location and circumstances of the checkpoint, and write down what happened while the events are still fresh in your memory.
Details that may later matter include:
- Where the checkpoint was located
- Whether warning signs were visible
- How vehicles were selected for screening
- How long you were detained
- What questions the officer asked
- What observations the officer claimed to make
- Which field sobriety or breath tests were requested
- Whether video cameras or body-worn cameras were present
You can also read our guide explaining what to do after a DUI arrest in California.
Learn More About California DUI Law
For more information about DUI offenses, BAC limits, chemical testing, and other California rules, see our guide to California DUI laws.
For information about possible criminal and driver’s-license consequences, read our guide to California DUI penalties.
Talk to a Fresno DUI Attorney
If you were arrested at a DUI checkpoint in Fresno or elsewhere in Central California, the checkpoint procedures and the evidence obtained during the subsequent investigation should be reviewed carefully.
Gregory W. Fox has more than 20 years of experience defending people accused of DUI and other California criminal offenses.
Call the Law Office of Gregory W. Fox at (559) 222-5800 to request a confidential consultation.
You can also learn more about our Fresno DUI defense services.