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What Percentage of DUIs Are Drug-Related?

Interviewer: We’ll focus on illegal drug-related DUIs for illegal first. Percentage wise, out of all the DUIs you see, what percentage tend to be for illegal drugs like marijuana, cocaine, or heroin?

Brian: As far as DUIs, generally speaking, illegal drugs probably represent about 10% of the total cases. I would say of the DUIs concerning illegal drugs and prescription medications, illegal drugs are probably about 40% of the total.

Prescription Drug Use While Driving Comprise Most of the DUI Cases

Interviewer: It’s actually more prescription drugs that cause DUIs, is that right?

Brian: We definitely see more prescription drug cases. The police are starting to really arrest people that have been taking medications for their entire lives, people who are on new medications and people who had their medication doses changed.

The problem is the prosecutors have to prove that it was the medications that caused impairment. So if there is any issue with driving, any type of weaving, any type of swerving, any wide turn, anything, the prosecutor will blame that on the prescription medication simply because the prescription medications were present.

How Do the Police Suspect Impairment By Prescription Medication?

Interviewer: In those prescription medication cases, when people are stopped by Police, how does it end up with the police suspecting they are on prescription medications? Do they just ask or are people truly impaired by the drugs?

Brian: A lot of prescription medications cases don’t start out with the belief that someone is impaired by the prescription medications. Often an officer will see something they think is odd.

Sometimes, it is bloodshot, watery eyes. Sometimes it is slurred speech. Sometimes it is dilated pupils or overly large pupils. An officer will sometimes just rule out alcohol impairment but feel that there is some sort of other impairment present.

Blood Tests Are the Most Common Method for Testing for the Presence of Prescription Drugs

Quite often what happens is an officer will believe that there is alcohol impairment and draw blood under the theory that there is alcohol impairment. When the results come back, thy show a very low presence of alcohol or no presence of alcohol.

The police will simply test the blood for prescription medications or drugs at that point in a ‘Hail Mary’ move to see if there is anything present. If there is something present, such as prescription medications, it is sometimes the same prescription medications that people have been taking for years.

The prosecutor will then allege that it was those prescription medications that must have caused the impairment because impairment was observed.

If You Are Stopped, Should You Tell a Police Officer that You Are Taking Prescription Medication?

Interviewer: Does it help anyone to tell the police that they are on certain prescription medications or does it just hurt their case?

Brian: I think it does hurt the case. With prescription medications, there are some that might cause impairment, and there are others that absolutely would not cause impairment.

Admitting that you were taking prescription medication is on par with admitting that you only had two drinks or that you only smoked a ”little” marijuana.

Admission is going to be used against you and it gives the prosecutor ammunition to say, “See these people were on medication, there is no denying they are on medication, that must have been what the officer was seeing that indicated that there was some sort of impairment present at the time.”

Interviewer: I’m sure most people don’t even think or dream that taking prescription medication could end up with them being charged with DUIs. I would guess most people are surprised and they admit it because they don’t think there is any danger.

By Brian Douglas Sloan

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Brian Douglas Sloan


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Best DUI Lawyer in Phoenix

Why DUI Attorney Brian Douglas Sloan?


19+ Years SOLELY Focused on DUI Defense


4,200+ DUIs Successfully Defended

Top Accolades

  • Only DUI "Power Lawyer" in the Nation Featured in USA Today, 2022

  • Top 10 in Arizona

Top 1%

Top One Percent in the Nation

Superb 10/10

4.9 / 5.0


brian sloan on the cover of attorney at law magazine

“I am one of only a handful of Phoenix DUI Lawyers that focuses solely on DUI Defense representation.”

I have spent my entire career SOLELY focused on Arizona DUI Defense Representation, having personally defended more than 4,400 Driving Under the Influence (DUI) clients in the past 19+ years.

If you’re looking for a Divorce Attorney, Tax Attorney, Civil Attorney, etc., I can comfortably say, "I’m not the one for you." I ONLY defend DUI cases in most of Maricopa County, Arizona.

Coming up with traditional, as well as outside-the-box motions and defenses for my clients, often with good results, is the hallmark of my practice.

Lawyers that say they are "aggressive" or "will fight for you" are a dime a dozen. They use these phrases because it is a proven advertising phrase. Being "aggressive" isn’t the same as being good, and is often used to put on a show to hide the fact that they aren’t doing anything meaningful for the client.

The same is true for the Lawyers claiming to do DUI Defense, and Criminal Cases, and Accident Cases, and Divorces, etc. A Jack-of-all-Trades is a master of none! By handling all sorts of cases, they take away from their ability to truly focus on DUIs, and keep up-to-date on the latest changes in DUI Defense Representation.

What I offer is intelligent, quality DUI Defense at an exceptional price. Unlike many other law firms, if you hire The Law Offices of Brian D. Sloan, you actually get me representing you, doing all the work, and working the case. You aren’t hiring one guy with all the experience, but getting the underling with very little knowledge or experience.

I work seven days a week on my client’s cases, and spend hours laying all my thoughts out for my clients in writing, so they can understand their options, and my recommendations. No other DUI Lawyer in the state does this. I try to do what I can to go above-and-beyond for my clients. I hate when the businesses I deal with nickel-and-dime me with hidden costs, and I take pride in not doing that to my clients.

I have not only taught other lawyers how to do DUI Defense Representation at statewide seminars, but I have produced DUI Legal Guides used by defense lawyers across Arizona.

I am one of Arizona's most award-winning DUI Defense Lawyers, as well as being recognized nationally. I was the only DUI Defense Lawyer in the United States named a "Power Lawyer" in a 2022 issue of USA Today

There are no other private Lawyers in Arizona that have personally defended more DUI cases than I have. And as a bonus, I offer a very reasonable flat rate for my legal services, with a payment plan, and without any hidden charges. This guarantees that I offer some of the most competitive rates among all Arizona DUI Attorneys, while being a well-documented and preeminent leader in the field of DUI Defense Representation.

Over the years, countless people have come to me after discovering that their first lawyer made a mistake, gave them false hope or false promises, or simply took their money and didn't do much to advance their case. And you would be surprised at how often this happens.

So, instead of wasting time and money on the wrong DUI Defense Attorney, do yourself a favor and get the proven and well-recognized best DUI Lawyer in Phoenix and the surrounding areas of Maricopa County.

You can reach me on my personal cell phone at 480-720-7839 for a Free ‘In Depth’ Consultation.

I personally defend DUI cases in urban Maricopa County City, Town, and Justice Courts, including:

Ahwatukee / Agua Fria / Arcadia Biltmore / Avondale / Buckeye / Chandler / Country Meadows / Desert Ridge / Dreamy Draw / Downtown / East Mesa / El Centro / Encanto / Gilbert / Glendale / Goodyear / Guadalupe / Highland / Kyrene / Litchfield Park / Maryvale / McDowell Mountain / Mesa / Moon Valley / North Mesa / Peoria / Phoenix / Queen Creek / San Marcos / San Tan / South Mountain / Scottsdale / Tempe / University Lakes / West McDowell / West Mesa / White Tank

For any other Courts in the State of Arizona, including Felony cases, I would recommend my associates on The Arizona DUI Team, whom I work closely with, but I am not the one personally representing the client.

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Brian Douglas Sloan

DUI Attorney

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