Is “Necessity” a Valid Defense to Drunk Driving in Colorado? When It Applies, Legal Requirements, and Key Limitations Explained

Under Colorado law, the necessity defense may apply if a driver can prove they operated a vehicle while impaired to prevent a greater and more immediate harm, and that no reasonable legal alternative existed.

This defense is rarely successful because Colorado courts apply strict legal standards. Simply believing it was safer or more convenient to drive is not enough. The court carefully evaluates whether an actual emergency existed, whether the driver created the emergency, and whether driving while impaired was the only reasonable option.

If you’re facing a DUI charge, understanding how the necessity defense works can help you determine whether it may apply to your case and why experienced legal representation is critical.

What Is the Necessity Defense in Colorado DUI Cases?

The necessity defense—sometimes called a choice of evils defense or justification defense—is recognized in limited criminal cases. Rather than arguing that the defendant did not commit the offense, it argues that breaking the law was necessary to prevent a more serious and immediate harm.

In a Colorado DUI case, the defense does not excuse impaired driving simply because it seemed like the best option. Instead, the court requires evidence showing the driver had no reasonable alternative and acted only because of an emergency.

The Threat Must Be Immediate

A necessity defense generally requires an emergency involving imminent danger.

Examples may include:

• A medical emergency requiring immediate transportation

• Escaping an immediate threat of violence

• Preventing serious bodily injury

• Avoiding another life-threatening situation

The danger must exist at the moment the decision to drive is made. A possible future problem or general concern typically does not satisfy this legal requirement.

There Must Be No Reasonable Legal Alternative

One of the most difficult parts of proving necessity is showing there were no lawful alternatives available.

Before accepting the defense, the court may consider whether the driver could have:

• Called 911

• Requested emergency medical assistance

• Asked a sober driver for help

• Used a rideshare or taxi

• Waited until it was safe to drive

• Used another available transportation option

If any reasonable alternative existed, the necessity defense is much less likely to succeed.

The Driver Cannot Create the Emergency

Colorado courts also examine how the emergency occurred.

The necessity defense may be unavailable if the driver:

• Knowingly created the dangerous situation

• Acted recklessly before the emergency

• Could have reasonably prevented the circumstances

For example, voluntarily placing yourself in a foreseeable dangerous situation may weaken or eliminate the defense.

The Response Must Be Reasonable

Even when an emergency exists, the response must remain proportional to the danger.

Courts evaluate questions such as:

• Was driving truly necessary?

• Did the driver travel only as far as needed?

• Did the emergency continue throughout the trip?

• Did the driver’s actions create unnecessary additional risk?

The more limited and reasonable the response, the stronger the potential argument.

Strong Evidence Is Essential

A necessity defense depends on credible evidence—not simply the driver’s explanation.

Helpful evidence may include:

• Medical records

• 911 call recordings

• Emergency dispatch reports

• Surveillance video

• Photographs

• Witness testimony

• Police reports

• GPS records

• Hospital documentation

Without objective evidence, proving necessity becomes considerably more difficult.

When Is Necessity a Valid Defense to Drunk Driving in Colorado?

Every DUI case is different, but courts generally evaluate several key factors before allowing a necessity defense.

An Immediate Emergency Existed

The danger must involve an urgent threat requiring immediate action.

Possible examples include:

• Transporting someone experiencing a life-threatening medical emergency

• Escaping immediate physical violence

• Preventing imminent serious bodily injury

Courts generally reject situations involving inconvenience, poor planning, or personal preference.

Driving Prevented a Greater Harm

The necessity defense is based on preventing something more serious than the DUI offense itself.

The court weighs:

• the danger avoided

• the risk created by impaired driving

If driving while impaired prevented a substantially greater harm, the defense may become legally relevant.

No Practical Alternative Was Available

Judges closely examine every possible alternative.

Questions often include:

• Could emergency responders have arrived in time?

• Was another licensed driver nearby?

• Could public transportation have been used?

• Was there enough time to wait?

If the answer is yes, the defense becomes significantly weaker.

Every Case Is Decided Individually

There is no automatic rule allowing necessity as a DUI defense.

Instead, courts consider:

• the facts

• available evidence

• witness credibility

• timing

• surrounding circumstances

• applicable Colorado law

Even cases with similar facts may produce different outcomes depending on the evidence presented.