DUI vs BUI in Arizona (ARS 5-395)

TL;DR

Arizona prosecutes boating under the influence (BUI) under A.R.S. 5-395 with the same 0.08 per se threshold and slightest-degree theory as DUI under A.R.S. 28-1381. Penalties scale similarly, but BUI cases differ in investigation procedure, jurisdiction, and license consequences. Arizona Game and Fish enforces most lake violations.

Most people in Arizona understand the basics of a DUI charge. You drive with a blood alcohol concentration at or above 0.08%, and you face criminal penalties under ARS §28-1381. What catches people off guard is that Arizona applies nearly identical BAC thresholds to operating a boat. Under ARS §5-395, operating or being in actual physical control of a motorized watercraft while impaired carries serious criminal consequences. The charge is commonly called BUI (boating under the influence), and it follows many of the same rules as a DUI, with several important differences that affect how cases are investigated, prosecuted, and defended.

If you were stopped on an Arizona lake or river and charged with BUI, you need to understand exactly how this charge works and where it diverges from a standard DUI. Our overview of standard Arizona DUI law (ARS 28-1381) goes deeper into the rules.

The Statutes: ARS §5-395 and ARS §28-1381

Arizona’s DUI statute, ARS §28-1381, applies to motor vehicles on public roads. The law makes it illegal to drive or be in actual physical control of a vehicle while impaired to the slightest degree by alcohol, drugs, or any combination. The per se BAC limit is 0.08%.

Arizona’s BUI statute, ARS §5-395, mirrors much of that language but applies to motorized watercraft. Under this law, a person commits boating under the influence by operating or being in actual physical control of a motorized watercraft while under the influence of intoxicating liquor, any drug, a vapor-releasing substance containing a toxic substance, or any combination of these if the person is impaired to the slightest degree. The same 0.08% BAC threshold triggers a per se violation.

Both statutes also incorporate Arizona’s tiered BAC system. A BAC of 0.15% or higher triggers extreme DUI/BUI penalties, and a BAC of 0.20% or higher triggers super extreme penalties. These enhanced tiers apply to boating charges in the same way they apply to driving charges.

The core legal standard is the same: impaired to the slightest degree. Prosecutors do not need to prove you were falling-down drunk. They need to prove that alcohol or drugs affected your ability to operate the watercraft, even minimally.

Key Differences Between DUI and BUI

Despite the shared BAC thresholds and “impaired to the slightest degree” standard, DUI and BUI cases play out very differently in practice.

Implied Consent Does Not Apply to BUI

This is one of the most significant differences. Under Arizona’s implied consent law (ARS §28-1321), anyone who operates a motor vehicle on a public road has already consented to chemical testing if an officer has reasonable grounds to believe they are impaired. Refusing a breath or blood test after a DUI arrest triggers an automatic 12-month license suspension, regardless of whether the person is ever convicted.

That implied consent framework does not extend to watercraft. ARS §5-395 does not contain an implied consent provision. If you refuse a breath or blood test during a BUI investigation, there is no automatic administrative suspension of your driver’s license tied to the refusal itself. Officers can still seek a warrant for a blood draw, and prosecutors can still argue that refusal suggests consciousness of guilt. But the automatic penalty structure that makes DUI refusals so costly does not apply on the water.

This distinction matters for defense strategy, and it also affects how officers approach BUI investigations compared to DUI stops.

Who Enforces BUI Laws

On the road, you deal with city police, county sheriff’s deputies, DPS troopers, and occasionally tribal police. On the water, enforcement comes from a different set of agencies. The Arizona Game and Fish Department has primary authority over waterway enforcement. County sheriff marine units patrol major lakes and reservoirs. At Lake Havasu, the Mohave County Sheriff’s Office and the San Bernardino County Sheriff’s Department (on the California side) both run marine patrols. The Bureau of Land Management also has jurisdiction in certain areas.

These officers are specifically trained in watercraft stops, and they spend their shifts on the water watching boating behavior. During high-traffic weekends, multiple agencies often run coordinated enforcement operations.

Field Sobriety Testing on Water

Standard field sobriety tests were designed for dry, flat, stable ground. The walk-and-turn, one-leg stand, and horizontal gaze nystagmus tests all assume the subject is standing on a solid surface. On a boat, the deck is moving. The person has likely been in the sun for hours. They may be dehydrated. They may have been exposed to wind, waves, engine vibration, and glare all day.

Officers conducting BUI investigations sometimes administer modified versions of these tests on the boat or at a dock. In some cases, they transport the subject to shore before administering standard field sobriety tests. The conditions under which these tests are given create real questions about reliability, and those questions become important in court.

The horizontal gaze nystagmus (HGN) test is the one that translates most directly to a marine environment because it does not require the subject to balance or walk. But even HGN can be affected by fatigue, sun exposure, and the vestibular disruption that comes from spending hours on moving water.

What Officers Look For on the Water

Law enforcement on Arizona’s lakes and rivers is not random. Officers watch for specific boating behaviors that suggest impairment.

Erratic speed changes, particularly sudden acceleration followed by abrupt slowing, get attention. So does difficulty maintaining a consistent course, weaving between lanes in no-wake zones, or operating too close to other boats, docks, or swimmers. Near-miss incidents with other watercraft or fixed objects almost always prompt a stop. Operating without running lights after dark, ignoring navigational markers, and riding the bow or gunwale in an unsafe manner all give officers a reason to approach.

Officers also watch the boat ramp. Loading and unloading a boat requires coordination and spatial awareness. Difficulty backing a trailer, repeated failed attempts to launch, or trouble securing the boat to the trailer after pulling out of the water all provide observations that officers may later cite as indicators of impairment.

Once an officer makes contact, they assess the operator’s speech, coordination, eyes, and behavior. The smell of alcohol on a boat full of open containers does not, by itself, prove the operator was drinking. But combined with observed impairment, it adds to the probable cause picture.

“Actual Physical Control” on the Water

Both the DUI and BUI statutes cover actual physical control, not just active operation. On the road, this means you can be charged with DUI while sitting in a parked car with the engine off if the circumstances suggest you were in control of the vehicle. Courts consider factors like whether the keys were in the ignition, whether the engine was warm, and where the vehicle was located.

On the water, actual physical control analysis works similarly but raises unique questions. If someone is sitting at the helm of an anchored boat with the engine off, are they in actual physical control? What about a person asleep on a houseboat that is tied to a dock? The answer depends on facts specific to each situation. If the boat could be put into motion quickly, and the person had the apparent ability to do so, prosecutors will argue actual physical control. If the boat was securely anchored or moored with no realistic prospect of movement, the defense has a stronger argument.

These fact-specific questions make actual physical control cases on the water more defensible than many people assume.

BUI Penalties in Arizona

BUI penalties in Arizona track closely with DUI penalties, though the administrative consequences differ because boating does not involve a driver’s license in the same way driving does.

First Offense BUI

A first-offense BUI is a class 1 misdemeanor. Penalties can include up to six months in jail (with mandatory minimums depending on BAC level), fines and surcharges that can total several thousand dollars, probation, alcohol screening and treatment, and community service. For a standard first-offense BUI at the 0.08% level, mandatory jail time starts at 24 consecutive hours, though judges often convert a portion to home detention or community service.

At the extreme level (0.15% BAC or higher), mandatory minimums increase. At the super extreme level (0.20% or higher), they increase further, with 45 days of mandatory jail time for a first offense.

Second Offense BUI

A second BUI within 84 months (seven years) triggers enhanced mandatory minimums. Jail time increases, fines increase, and the court will almost certainly order extended substance abuse treatment. A second offense at the extreme or super extreme level carries some of the harshest misdemeanor penalties in Arizona criminal law.

Aggravated (Felony) BUI

BUI becomes a felony under circumstances that mirror aggravated DUI. A third BUI offense within 84 months can be charged as a class 4 felony. BUI committed while a person under 15 years of age is on the watercraft is also a felony. BUI committed while the operator’s license is suspended, cancelled, or revoked (due to a prior DUI or BUI) can trigger felony charges as well.

Felony BUI carries the possibility of state prison time, and a felony conviction creates lasting consequences for employment, housing, and civil rights.

BUI Causing Injury or Death

When a BUI incident results in injury or death, the charges escalate significantly. A person who causes serious physical injury to another while operating a watercraft under the influence can face aggravated assault charges in addition to the BUI. If the incident results in death, manslaughter or negligent homicide charges may apply.

These cases are prosecuted aggressively. The combination of impairment and a catastrophic outcome on the water leads to charges that carry years in prison. Negligent operation of a watercraft can compound the situation, adding additional charges to an already serious case.

Arizona sees boating fatalities every year, and a significant percentage involve alcohol. Prosecutors and judges treat these cases with the same gravity as fatal DUI cases on the road.

Chemical Testing in BUI Cases

Officers investigating a suspected BUI can request breath, blood, or urine testing. The most common methods are preliminary breath testing on the water (using a portable device) followed by a more formal breath or blood test on shore or at a nearby facility.

Because implied consent does not apply, the process for obtaining chemical evidence in a BUI case often involves seeking a warrant for a blood draw. In high-enforcement areas like Lake Havasu, officers may have pre-prepared warrant templates and access to on-call judges, allowing them to obtain warrants quickly. The practical effect is that refusal slows the process but does not necessarily prevent testing.

Blood test results are the most reliable and the most commonly used at trial. Breath test results from portable devices are less reliable and more vulnerable to challenge. Urine testing is the least common and the least accurate for determining BAC at the time of operation.

The time between the stop and the actual blood draw matters. Alcohol metabolizes at a predictable rate, and the longer the delay, the more room there is to argue that the BAC at the time of testing does not accurately reflect the BAC at the time of operation. This is the same retrograde extrapolation issue that arises in DUI cases, and it applies with equal force in BUI prosecutions.

The Boat Ramp Problem: DUI Going To or From the Water

One question that comes up frequently: can you get a DUI while driving to or from the boat ramp? The answer is yes. Once you are operating a motor vehicle on a public road, the DUI statute applies. This includes the road leading to the launch, the parking area (if it is publicly accessible), and the drive home.

This means a single day on the water can expose a person to both statutes. If you drink on the boat and then drive home, you could face a BUI for the time on the water and a DUI for the drive. These are separate offenses under separate statutes, and they can be charged and prosecuted independently.

Officers at boat ramps know this. During enforcement operations, some officers position themselves in the parking area specifically to observe drivers leaving after a day on the water. The transition from boat to vehicle is one of the highest-risk moments for arrest.

If you are pulled over on the road after a day of boating, the officer will apply the same DUI investigation protocol used in any traffic stop. The fact that you were boating earlier is relevant context, not a defense.

Lake Havasu and Arizona Waterway Enforcement

Lake Havasu is the epicenter of BUI enforcement in Arizona. The lake draws hundreds of thousands of visitors each year, particularly during spring break, Memorial Day, Fourth of July, and Labor Day weekends. The combination of high boat traffic, party culture, and aggressive enforcement creates a situation where BUI arrests spike predictably during these periods.

The Mohave County Sheriff’s Office marine unit runs regular patrols and conducts sobriety checkpoints on the water during peak weekends. The Arizona Game and Fish Department coordinates with local agencies for saturation patrols. During spring break, enforcement operations run around the clock.

Lake Pleasant, Saguaro Lake, Canyon Lake, Apache Lake, and Bartlett Lake also see regular enforcement, particularly on holiday weekends. The Salt River (tubing corridor through Tonto National Forest) presents its own enforcement challenges, as people frequently combine alcohol with tubing and then drive home.

Rideout Law Group’s Lake Havasu City office handles BUI cases from the lake and surrounding waterways regularly. The patterns of enforcement, the agencies involved, and the specific testing procedures used at Havasu are all familiar territory.

BUI and Commercial Watercraft Operators

Commercial watercraft operators, including charter boat captains, tour operators, and anyone operating a vessel for hire, face a lower BAC threshold. Under federal law (46 U.S.C. §2302), the BAC limit for commercial operators is 0.04%, half the standard limit. Arizona state enforcement can also apply to commercial operators on state waters.

A BUI conviction for a commercial operator can result in loss of their captain’s license (issued by the U.S. Coast Guard), effectively ending their career on the water. The consequences extend far beyond the criminal penalties.

Impact on Boating Privileges and Driver’s License

A BUI conviction does not automatically trigger a suspension of your Arizona driver’s license in the same way a DUI does. Because the BUI statute operates under a different framework, the MVD administrative suspension process that follows a DUI arrest does not apply identically.

However, a BUI conviction does go on your criminal record. If you later receive a DUI, the prior BUI may be considered in sentencing. Courts and prosecutors track patterns of substance-related offenses across both statutes.

Arizona Game and Fish can restrict or revoke boating privileges following a BUI conviction. This is a separate administrative process from MVD driver’s license actions. Losing boating privileges may seem less consequential than losing a driver’s license, but for people who live on or near the water, it significantly affects daily life.

BUI and Insurance

A BUI conviction affects insurance, though the specifics depend on the type of coverage. Boat insurance policies typically contain exclusions for incidents occurring while the operator is under the influence. If a BUI-related accident causes property damage or injury, the insurer may deny the claim entirely, leaving the boat owner personally liable for all damages.

Auto insurance can also be affected. While a BUI is not a moving vehicle violation, it is a criminal conviction involving substance impairment. Some auto insurers treat it the same way they treat a DUI when calculating risk and setting premiums. SR-22 filing requirements, which commonly follow a DUI conviction, do not automatically follow a BUI, but individual insurer policies vary.

Defense Strategies for BUI Charges

BUI cases present defense opportunities that differ from typical DUI cases. The unique environment, the different procedural rules, and the challenges of waterborne investigation all create openings.

Challenging the Stop

Officers need reasonable suspicion to stop a watercraft, just as they need reasonable suspicion to pull over a car. But on the water, “reasonable suspicion” can be subjective. Was the boating pattern actually erratic, or was the operator reacting to waves, wind, or wake from another vessel? Officers sometimes interpret normal boating behavior as impaired behavior, particularly when they are looking for impaired operators during a saturation patrol.

If the stop lacked reasonable suspicion, everything that followed (the field sobriety tests, the breath test, the blood draw) may be subject to suppression.

Testing Accuracy

Chemical test results are only as reliable as the procedures used to obtain them. Was the breath testing device properly calibrated? Was the blood sample drawn, stored, and transported correctly? Was there an unreasonable delay between the stop and the test, creating a retrograde extrapolation problem?

Portable breath testing devices used on boats are exposed to heat, moisture, and movement. These environmental factors can affect accuracy. Blood draws conducted at remote locations near lakes may not follow the same chain-of-custody protocols used at a hospital or police station.

Operator Identification

On a boat with multiple people aboard, identifying who was actually operating the watercraft at the time of the alleged violation can be more difficult than identifying the driver of a car. If the operator position changed during the trip, or if the officer did not directly observe who was at the helm when the impaired operation allegedly occurred, the prosecution may have difficulty proving the defendant was the operator.

Environmental Factors and Field Sobriety Tests

As discussed above, the conditions on the water undermine the reliability of standard field sobriety tests. Sun exposure, dehydration, fatigue from physical activity, wave-induced vestibular disruption, and the effects of heat can all mimic signs of impairment. A skilled defense attorney will challenge the validity of field sobriety results obtained under these conditions.

Increased Enforcement Periods

BUI enforcement in Arizona follows a predictable calendar. The highest-enforcement periods include:

Spring break (mid-March through mid-April) brings the most concentrated enforcement at Lake Havasu. Memorial Day weekend marks the unofficial start of boating season and the beginning of summer enforcement saturation. Fourth of July weekend sees peak boat traffic on every major Arizona lake. Labor Day weekend closes out the summer enforcement season.

During these periods, agencies run coordinated operations with additional officers, boats, and resources deployed specifically to identify and arrest impaired operators. Portable breath testing equipment, rapid warrant systems, and shore-based processing stations all speed up the arrest process.

If you plan to be on Arizona waters during these weekends, you should assume that enforcement will be active and visible.

Frequently Asked Questions

Is a BUI the same as a DUI in Arizona? No. BUI is charged under ARS §5-395, which applies to motorized watercraft. DUI is charged under ARS §28-1381, which applies to motor vehicles. The BAC thresholds and “impaired to the slightest degree” standard are the same, but the investigation procedures, implied consent rules, and administrative consequences differ.

Can I refuse a breath test during a BUI stop? Yes. Because Arizona’s implied consent law does not apply to watercraft, refusing a breath test during a BUI investigation does not trigger the automatic 12-month license suspension that follows a DUI refusal. However, officers can obtain a warrant for a blood draw, and prosecutors may argue that your refusal indicates consciousness of guilt.

Will a BUI conviction affect my driver’s license? A BUI conviction does not automatically suspend your Arizona driver’s license the way a DUI does. However, the conviction appears on your criminal record and may influence sentencing if you later face a DUI charge. It can also affect insurance rates.

What are the penalties for a first-offense BUI in Arizona? A first-offense BUI is a class 1 misdemeanor. Penalties include mandatory jail time (starting at 24 consecutive hours for standard BUI, increasing for extreme and super extreme BAC levels), fines and surcharges, probation, alcohol screening, and possible community service.

Can I be charged with both DUI and BUI on the same day? Yes. If you operate a boat while impaired and then drive a vehicle on a public road while still impaired, you can be charged with BUI for the boating and DUI for the driving. These are separate offenses under separate statutes.

What BAC level triggers extreme BUI in Arizona? The same thresholds that apply to DUI also apply to BUI. A BAC of 0.15% or higher triggers extreme penalties. A BAC of 0.20% or higher triggers super extreme penalties, which carry significantly higher mandatory jail time.

Does Arizona enforce BUI on the Salt River? Yes. The Salt River, particularly the tubing corridor through the Tonto National Forest, is subject to BUI enforcement. While tubing itself may not involve a “motorized watercraft” under ARS §5-395, officers enforce public intoxication laws and DUI laws at access points and parking areas where people drive to and from the river.

Can I get a BUI on a jet ski? Yes. Jet skis (personal watercraft) are motorized watercraft under Arizona law. ARS §5-395 applies to any motorized watercraft, including jet skis, pontoon boats, bass boats, ski boats, and houseboats. Unsafe operation of personal watercraft can result in additional charges beyond BUI.

Protect Your Record. Call Rideout Law Group.

A BUI charge in Arizona carries real criminal penalties, potential jail time, and consequences that follow you for years. The defense strategies available in BUI cases are different from those in standard DUI cases, and the procedural differences between the two statutes create opportunities that an experienced attorney can identify and press.

Rideout Law Group defends BUI and DUI cases across Arizona, with offices positioned to serve clients facing charges on the state’s busiest waterways.

Scottsdale Office: 480-584-3328 Lake Havasu City Office: 928-854-8181

Call today for a free consultation. The sooner you have a defense attorney reviewing your case, the stronger your position.

Related Resources From Rideout Law

Key Takeaways

BUI is governed by A.R.S. 5-395; DUI by A.R.S. 28-1381. Both apply a 0.08 per se threshold and a slightest-degree theory.
Extreme BUI applies at 0.15 BAC; super extreme at 0.20, just like DUI.
BUI does not directly suspend a driver’s license, but it can affect boater education and watercraft registration.
Arizona Game and Fish Department officers conduct most BUI investigations on lakes such as Havasu and Pleasant.
Field sobriety tests on a moving boat are inherently unreliable and can be challenged on those grounds.

Arizona Statute References

Statute citations in this article reference the Arizona Revised Statutes (A.R.S.). Read the full text on the Arizona Legislature website:

A.R.S. 5-395: Arizona Revised Statutes
A.R.S. 5-395.01: Arizona Revised Statutes
A.R.S. 28-1381: Arizona Revised Statutes
A.R.S. 28-1382: Arizona Revised Statutes

Talk to a Rideout Law Group Attorney

If you are facing criminal charges in Arizona, the decisions you make in the first few days can shape the rest of your case. Rideout Law Group represents clients across Maricopa and Mohave County from offices in Scottsdale and Lake Havasu City.

Call (480) 584-3328 for a free consultation, or contact us online to schedule a confidential review of your case.

Legal Disclaimer

This article is provided for general informational purposes only and does not constitute legal advice. Reading this post does not create an attorney-client relationship between you and Rideout Law Group. Every criminal case turns on specific facts, court of jurisdiction, and procedural posture. If you are facing charges in Arizona, consult a licensed Arizona criminal defense attorney about your individual situation. Past results do not guarantee future outcomes.