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How Does The Ignition Interlock Device Work For Commercial Drivers?

There is no special license. There used to be a business vehicle exception for ignition interlock devices, so that you have to have an ignition interlock device in your civilian vehicle but if you were driving a business vehicle, it was not required. Too many people took advantage of that and declared their civilian vehicle as their business vehicle. Maybe they started a business and then claimed that it was a business vehicle, so legislature did away with that a couple of years back. Now technically, even if you are a truck driver, hopefully your employer is okay with you installing an ignition interlock device on your eighteen wheeler, otherwise there is no exception. You must have an ignition interlock device on any vehicle you operate including the commercial vehicle.

Are People Charged With Aggravated DUI Supposed To Serve Additional Requirements Along With The Ignition Interlock Device?

A first-time super extreme requires eighteen months of ignition interlock device. A second-time super extreme requires two years of ignition interlock device and any felony DUI, which is aggravated DUI, requires two years of ignition interlock device. It is more time than a first-time regular or actually a first- or a second-time regular or a first- or second-time extreme.

Can Early Removal Of Ignition Interlock Device Be Petitioned?

It is actually not a petition. It is simply that if the person is convicted of a first-time regular alcohol DUI, they are required to have one-year of ignition interlock device. However, that can be reduced down to six months if they do the first six months correctly. Because they are going in to their ignition interlock device provider and maintaining the ignition interlock device monthly, at the six-month mark, if the ignition interlock device provider has let the Motor Vehicle Division know that the person was doing everything that they were supposed to do, then they are going to let the Motor Vehicle Division know that, “It’s been six months. The person has done everything that they are supposed to do”.


The Motor Vehicle Division will send out a letter saying, “You have done everything you are supposed to do. You can now take your ignition interlock device off”. It is not anything that needs to be petitioned or requested, it is not an application, it should just be automatic. One thing that came up in one of my cases was that, technically, on a first-time regular DUI, being able to get the ignition interlock device off early for successfully completing the first six months, there is a provision in the law that if during that second six-months where you would not have the ignition interlock device but you were able to get it off early, if you end up getting charged with a DUI, you then have to put the ignition interlock device back on for another six months.

So, it is not really six months deleted, its more six months suspended as long as you do not get another arrest for a DUI within those six months.

Can Ignition Interlock Device Issues Be Difficult to Resolve In Court?

They can be. That is more on the civil side and so if there was an issue with the person’s ignition interlock device, either between them and the ignition interlock device company and the Motor Vehicle Division, I am not sure if an attorney would be a good value to hire. Hiring an attorney to try and assist in that type of matter that is not the type of attorney that I am. I just handle the DUI cases, criminal aspects of the DUI cases themselves, I do not handle the civil aspects with the Motor Vehicle Division or the ignition interlock device companies.

Advice For People Contemplating A Guilty Plea

I never recommend that people just go in there and say, “All right, I am guilty. Let me just take care of it”. A much greater chance that they are going to be taken advantage of, they are not going to know how to say certain things and not going to know how to apply certain laws. Very likely the person will be taken advantage of by the court or by the prosecutor. They will very likely end up with a much harsher sentence or the wrong sentence and so that is why it is so important, at the very least, to go with a public defender. If you cannot afford a private attorney, at least go with a public defender. Do not represent yourself. If you can afford a private attorney, I would much rather you go with a private attorney.

For more information on Interlock Device Installation For Motor Vehicles, a free initial consultation is your next best step. Get the information and legal answers you are seeking by calling 480-900-0384 today.

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Brian Douglas Sloan


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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

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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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