Seeing blue lights and a maze of cones ahead on a Friday night instantly spikes anyone’s heart rate. Sobriety roadblocks have become increasingly common across Southern California—especially throughout the South Bay in cities like Hermosa Beach, Torrance, Manhattan Beach, and Redondo Beach.  

While law enforcement frames these stops as public safety measures, the reality is that DUI checkpoints rely on broad police authority that can easily cross constitutional boundaries. Knowing your rights and how to navigate a roadblock calmly can protect you from an unlawful arrest.  

Here is crucial guidance on what to do—and what not to do—when approaching a DUI checkpoint.

1. Turning Away Isn’t Illegal, But Mind the Rules

A common misconception is that avoiding a checkpoint is an automatic crime. Legally, making a lawful turn onto a public street to avoid entering a roadblock is entirely within your rights.  

However, police actively monitor surrounding perimeter streets looking for a reason to pull you over.  

 Do: Make a standard, legal turn or lane change using your turn signal if you can safely bypass the stop.

 Don’t: Execute an illegal U-turn, make an unsafe lane change, or commit traffic violations. Law enforcement will immediately use any minor traffic infraction as a pretext to stop and detain you.  

2. Hand Over Documents Calmly

When it is your turn to stop, officers will ask for your driver’s license, registration, and proof of insurance.

 Have your documents accessible to avoid fumbling in the glove box, which officers often mistake for impaired motor skills.

 Roll your window down enough to comfortably hand over your documents. Keep your interactions brief, polite, and calm.

3. Know Your Right to Remain Silent

Officers routinely ask probing questions designed to get you to admit to drinking (e.g., “Where are you coming from tonight?” or “Have you had anything to drink?”).

You are legally required to identify yourself and produce vehicle documentation, but you are not required to answer incriminating questions.  

 Politely state: “I prefer to keep my answers brief, and I would like to exercise my right to remain silent until I speak with an attorney.”

 Avoid volunteering extra information about where you were or what you consumed.  

4. Voluntary vs. Mandatory Testing

Understanding the difference between optional field tests and mandatory post-arrest tests is critical:

 Field Sobriety Tests (FSTs): Physical balance coordination tests and preliminary roadside breathalyzers (PAS tests) are generally voluntary for drivers over 21 who are not on DUI probation. You have the right to politely decline roadside FSTs without penalty.

 Post-Arrest Chemical Tests: If an officer places you under formal arrest, California’s Implied Consent Law requires you to submit to an official breath or blood test. Refusing a post-arrest test carries severe administrative penalties, including automatic license suspension.

What to Do If You Are Arrested

If an officer places you under arrest, do not argue, resist, or try to convince them otherwise on the roadside. Remain silent, request to speak with legal counsel, and comply with official procedures.  

Checkpoints must strictly comply with constitutional standards established in California cases like Ingersoll v. Palmer. If police fail to follow mandatory procedures—such as failing to maintain continuous observation for breath tests, setting up checkpoints without proper neutral formulas, or stopping drivers without reasonable suspicion—the entire arrest and evidence collected can be challenged in court.  

If you or someone you know was stopped or arrested at a Southern California DUI checkpoint, contact Torrance DUI Attorney Matthew Ruff for a confidential case evaluation to protect your driver’s license and rights.