H. Michael Steinberg has 38+ years of experience practicing Colorado criminal law. Mr. Steinberg strives to stay current with the ever changing aspects of criminal law issues and updates resulting in his extensive knowledge of successful criminal defense as well as appellate work. He is also an active member of the National Association of Criminal Defense Lawyers, the Colorado Criminal Defense Bar Association, the Colorado Trial Lawyer's Association, and the Colorado and Arapahoe Bar Associations.

Weaving As A Basis For A DUI Stop And Investigation In Colorado

By H. Michael Steinberg Colorado Criminal Defense Lawyer

Weaving As A Basis For A DUI Stop And Investigation In Colorado - 1

This article addresses the misconception by many that if you don’t violate a specific traffic law – you cannot be stopped and investigated for a Colorado DUI – DWAI.

We Start With Some Important Constitutional Protections Of Rights

First, the two Constitutions – the United States and Colorado Constitutions protect against unreasonable searches and seizures. U.S. Const. amends. IV, XIV; Colo. Const. art. II, § 7.

All traffic stops fall within this important Constitution protection – against an unreasonable search and seizure.

A brief, “investigatory seizure” is legally justifiable when a police officer has a reasonable, articulable suspicion that criminal activity has occurred, is taking place, or is about to take place.

Under Colorado Law, a minor traffic offense can provide the basis for an investigatory stop.

The law does not examine a police officer’s subjective motives for stopping a driver suspected of committing a crime IF that officer has reasonable suspicion that a crime is being committed. That reasonable suspicion must be based on “an objectively reasonable basis to believe that a driver has committed a traffic offense.” That objectively reasonable basis that a traffic offense has been committed is required to justify making a traffic stop.

The DUI Criminal Defendant’s Tool To Suppress Illegally Seized Evidence – The Motion To Suppress Evidence

A Pretrial Motion to Suppress Evidence and Statements is the tool used by Criminal Defense Lawyers to challenge illegally seized evidence that is the product of an illegal stop under the Constitutional protections of the Fourth Amendment.

A hearing is held following the filing of Motion to Suppress at which the police officers responsible for the traffic stopped are called to testify about the legality of the stop.

Weaving Within Your Lane – Not A Traffic Crime – BUT Does It Rise To The Level Of Reasonable Suspicion To Stop Your Car For Suspicion Of DUI – DWAI?

In the 2018 Colorado case of People v. Johnston, 440 P.3d 1223 (2018), the Colorado Supreme Court considered whether weaving within a single lane of traffic can create a reasonable suspicion of criminal activity to justify an investigatory stop.

The law is clear in Colorado,  slightly weaving within a single traffic lane does not, without more, legally provide the kind of reasonable suspicion necessary to justify the stop of an automobile on the streets and highways of the state.

But what if, under the totality of the circumstances, a police officer’s observation of a vehicle finds the vehicle weaving continuously within its own lane for many miles?

Does that driving behavior create a reasonable suspicion justifying a traffic stop?

The answer is ….yes it can and here is why.

The Reasoning Of The Colorado Courts In The Johnston Case

What follows is the Colorado Court’s reasoning in the Johnston case.

The Constitutional protections of the Fourth Amendment do NOT require that a police officer actually see a suspect commit a traffic crime before making the decision to stop the vehicle for a crime such as DUI.

What may be innocent behavior in isolation will support a finding of reasonable suspicion if the officer maintains an objectively reasonable belief that the – under the totality of the circumstances – that conduct is consistent with criminal conduct.

The Court’s reasoning turned on the meaning behind the words of the Fourth Amendment as they apply and have been interpreted in investigatory stop cases.

If an investigatory stop is based on an observed traffic violation OR if the police officer has reasonable articulable suspicion that a traffic or equipment violation has occurred or is occurring, the officer can make an investigatory stop of the suspect vehicle.

Intra – Lane Weaving As Evidence Of Driving Under The Influence Of Alcohol In Colorado

A person commits no traffic infractions if their car is weaving within a single lane but that driving behavior may give rise to a traffic stop if that weaving within a single lane is repeated over a lengthy distance. Under these circumstances, a Judge may find that the stop of that driver on suspicion that he was driving under the influence of alcohol was justified.

Put differently, a traffic stop may be justified even in the absence of a driving violation if a Colorado police officer has reasonable suspicion to believe that the driver might be under the influence and alcohol or drugs. That police officer is not required to wait for an independent traffic violation to occur.

Conclusion – Limits On A Police Officer’s Use Of Driving Behaviors To Support Reasonable Suspicion To Stop

While there is no clear rule of law in this area (no bright line rule) it can be stated unequivocally, that an isolated incident of weaving within a single lane will not create reasonable suspicion for the crime of driving while under the influence.

It is nearly impossible for the average driver, as the Colorado Appellate  Court stated in Johnston … if the failure of a driver to:

“follow a perfect vector down the highway … were [a] sufficient reason[ ] to suspect a person of driving while impaired, a substantial portion of the public would be subject each day to an invasion of their privacy.”

The rule of law in Colorado remains as it always was – reasonable suspicion for an investigative stop must be based on the totality of the circumstances in each case.

Factors such as the prolonged weaving of a driver who never leaves his or her lane of traffic may, under the totality of the circumstances test, support a Judge’s finding that there is reasonable suspicion for the crime of driving under the influence – even if that driving was neither erratic nor unsafe.