Can Cops Run Your Plates for No Reason?

Can cops run your plates for no reason? Yes—officers in most jurisdictions, including Texas, can legally run your license plates without probable cause or a specific reason. Since plates are displayed publicly, courts consider them public information, not protected under the Fourth Amendment. 

Anderson, Cummings & Drawhorn will explain Texas law regarding license plate scans, how law enforcement uses this technology, and what to do if a routine check leads to a stop or further investigation.

Why Police Are Legally Allowed to Run License Plates Without Cause

In Texas, law enforcement officers can run a license plate without reasonable suspicion or probable cause. Courts have consistently held that checking a vehicle’s plate number does not violate the Fourth Amendment because the information is considered public.

Unlike a personal search or stop-and-frisk, scanning a plate doesn’t intrude on your body, possessions, or home. It’s an observation of something that’s already visible on public roads.

Police often run plates during routine patrols using onboard systems or automated readers. These checks help them identify:

• Expired registrations
• Outstanding warrants tied to the vehicle owner.
• Stolen vehicles
• Vehicles flagged in AMBER Alerts.

While this might feel invasive, Texas courts view it as part of standard policing.

Public vs. Private Information: What the Fourth Amendment Says

The Fourth Amendment protects individuals against “unreasonable searches and seizures,” but it doesn’t shield what is knowingly exposed to the public. License plates fall under that category.

When a vehicle is driven on a public road, the driver has no reasonable expectation of privacy in the plate number. Courts have ruled that officers can input plate numbers into databases, even without suspicion, because the action doesn’t constitute a search in the constitutional sense.

That said, other legal protections kick in if the plate scan leads to a stop or further investigation. Police must justify any additional action with facts or a valid legal basis, especially if they escalate from scanning to detaining or searching the driver.

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How Automated License Plate Readers (ALPRs) Work in Texas

Texas police departments increasingly use Automated License Plate Readers (ALPRs) to scan, record, and analyze thousands of plates daily. Mounted on patrol vehicles, traffic poles, or overpasses, ALPRs rapidly capture images and match them against law enforcement databases in real time.

What Information Can ALPRs Reveal?

These devices don’t just record your plate—they capture each scan’s date, time, and GPS coordinates. That means authorities can potentially track:

• Your travel patterns
• Your proximity to specific locations (like crime scenes).
• Frequent destinations

Although ALPRs enhance public safety, they also raise concerns about surveillance overreach, particularly when data is retained or shared with third-party agencies for extended periods.

Texas-Specific Laws Governing ALPR Use

Under Texas law, agencies using ALPRs must comply with data retention, use, and privacy policies. The Texas Transportation Code and the Driver’s Privacy Protection Act govern how information tied to license plates may be accessed and stored. Agencies must take measures to ensure:

• The data is used solely for law enforcement purposes.
• Personal driver information isn’t improperly disclosed.
• Retention periods are defined and followed.

When Can a Plate Scan Lead to a Traffic Stop?

While police can scan your plate without cause, they cannot pull you over unless the scan reveals something actionable. For example:

• An expired registration or inspection tag.
• A match to a stolen vehicle database.
• A connection to an active warrant or BOLO (Be On the Lookout) notice.

Suppose the plate scan doesn’t reveal any issues, such as expired registration, a warrant, or a match to a stolen vehicle. In that case, the officer generally cannot initiate a stop based on the scan alone. A lawful traffic stop in Texas must be supported by specific facts or a clear legal violation. 

Can Evidence from a Plate Scan Be Used in Court?

Yes, but with conditions. If a license plate scan leads to a legitimate stop and results in the discovery of evidence—such as contraband, weapons, or other illegal activity—that evidence can typically be used in court, as long as the stop was lawful.

However, if the stop was initiated without proper justification, any evidence found may be challenged and potentially excluded under the “fruit of the poisonous tree” doctrine. This legal principle is designed to keep unlawfully obtained evidence out of court.

Defense attorneys frequently challenge the validity of traffic stops triggered by ALPRs, especially when:

• The plate data was outdated or incorrect.
• The officer lacked corroborating evidence beyond the scan.
• The traffic stop extended beyond a reasonable timeframe.

What to Do If You’re Stopped After a Plate Scan in Texas

Getting pulled over after a license plate scan can be stressful, especially if you’re unsure why you were stopped. Here’s what we recommend:

• Stay calm and compliant, but do not volunteer unnecessary information.
• Ask the officer for the reason behind the stop.
• Avoid consenting to searches unless legally required.
• Take mental notes of what was said and done.
• Contact a lawyer if you believe your rights were violated.

Documenting the interaction can be helpful later, especially if your case goes to court. Small details, like the officer’s explanation or lack thereof, could be legally significant.

Your Rights Under Texas Law After a Traffic Stop

Texas law grants you the right to remain silent, refuse a search (unless there’s probable cause), and request legal representation. After a plate-based stop:

• You do not have to answer questions unrelated to the reason for the stop.
• You can decline a search unless the officer presents a warrant or probable cause.
• You are entitled to ask if you are free to leave.

The Driver’s Privacy Protection Act (DPPA) also limits how personal information from motor vehicle records can be accessed and used. However, law enforcement is generally exempt from these restrictions when the data is being used for official investigations or public safety purposes.

Need Legal Advice About an Unjustified Stop?

Unjustified stops raise serious legal concerns, especially when drivers wonder, “Can cops run your plates for no reason?” At Anderson, Cummings & Drawhorn, we hold law enforcement accountable when boundaries are crossed. Call 817-920-9000 for a free consultation. Your rights on Texas roads deserve protection.

Meet John Cummings

As a Fort Worth native and a double-Board Certified trial lawyer, John Cummings is dedicated to fighting for the rights of the injured. With a track record that includes record-setting verdicts and multi-million dollar settlements, he is an aggressive advocate who isn’t afraid to take on tough cases.

• Named a Top Personal Injury Lawyer by Fort Worth, Texas magazine.
• Recognized as a Texas Super Lawyer since 2003.
• Holds two Board Certifications in Personal Injury Trial Law and Civil Trial Law.

Free case consultation call us at (817) 920-9000