Tulsa County, Oklahoma DUI Lawyers

Kellie S. Howell
Claimed Lawyer ProfileSocial Media
Oklahoma County, OK DUI Attorney with 6 years experience
(405) 455-1032 Arvest Bank Tower, Suite 500
4600 SE 29th St.
Del City, OK 73115
Free ConsultationDUI, Criminal, Divorce and Family
Oklahoma City University School of Law
Ms. Kellie Howell practices in all areas of family law and criminal defense. Prior to joining Sansone Howell, Ms. Howell was the founding attorney at Howell Law Office, PLLC. In addition, Kellie has previously worked with the Hunsucker DUI Defense Firm, Oklahoma Juvenile Justice Center, and Oklahoma City University School of Law. Kellie is admitted to practice in all Oklahoma state courts and the Western District of Oklahoma Federal Court. She is a member of the Oklahoma Bar Association, American Bar Association, Federal Bar Association, Oklahoma Criminal Defense Lawyers Association, and Robert J. Turner American Inn of Court. ...
Ken Gallon
Claimed Lawyer ProfileResponsive Law
Ottawa County, OK DUI Attorney with 18 years experience
(918) 540-1818 23 B Street SE
Miami, OK 74354
Free ConsultationDUI, Criminal, Personal Injury and Traffic Tickets
University of Oklahoma College of Law
Miami, Oklahoma Family, Criminal and Bankruptcy Law Attorney Dedicated to Helping Those in Need of Legal Services Skilled attorney devoted to guiding clients through legal problems for more than 15 years J. Ken Gallon, located in Miami, Oklahoma, represents individuals who are experiencing financial debt issues, pending criminal charges or family problems in Oklahoma’s Delaware, Ottawa and Craig counties. J. Ken Gallon is a skilled attorney with more than 15 years of experience assisting clients to secure positive results in the areas of family law, criminal law and bankruptcy. His office team is dedicated to their clients, providing effective legal...
Joseph A Dobry
Claimed Lawyer ProfileSocial Media
Lincoln County, OK DUI Lawyer with 25 years experience
(405) 258-2475 111 West 9 Street
Chandler, OK 74834
DUI, Bankruptcy, Criminal and Personal Injury
University of Oklahoma College of Law
Practice of law for nearly 25 years in areas of bankruptcy, probate, estate administration, civil litigation, criminal defense, divorce, family law, adoption, guardianship, estate planning, wills, trusts. Call now for a consultation regarding your case. Joe, his wife and children reside in Chandler, Oklahoma. I would be honored to assist you with your legal matters. Thanks.
Debbie L Smith
Claimed Lawyer Profile
Noble County, OK DUI Attorney with 11 years experience
(580) 336-9595 PO Box 28
Perry, OK 73077
Free ConsultationDUI, Criminal and Juvenile
Oklahoma City University School of Law
Any criminal charges in Oklahoma - whether for felony or misdemeanor offenses - can be very harsh. With her wide range of legal knowledge and ability, Debbie L. Smith can provide you with an efficient and effective defense when you are in need. Your case could greatly benefit from the help and experience of a defense attorney who will work tirelessly on your behalf in order to help enhance your chances of a positive outcome in your case. Debbie Smith's experience as the Noble County Assistant District Attorney gave her great insight to become an effective criminal defense attorney. Ms....
Margaret L. Cook
Claimed Lawyer ProfileSocial Media
Cherokee County, OK DUI Attorney with 6 years experience
(918) 316-1953 133 N. Muskogee Ave., Ste A
Tahlequah, OK 74464
DUI, Domestic Violence, Family and Immigration
University of Tulsa College of Law
Scott D Harris
Claimed Lawyer Profile
Oklahoma County, OK DUI Lawyer with 9 years experience
(405) 301-8504 1715 N. Broadway Avenue
Oklahoma City, OK 73103
Free ConsultationDUI, Bankruptcy, Criminal and Personal Injury
Oklahoma City University School of Law
Daniel Ray Bays
Claimed Lawyer ProfileSocial Media
Oklahoma County, OK DUI Attorney with 13 years experience
(405) 310-2142 9024 S.E. 29th St. Suite A
Oklahoma City, OK 73150
DUI, Bankruptcy, Criminal and Personal Injury
Daniel R. Bays is a practicing attorney, whose central office is in Oklahoma City, Oklahoma. After receiving his undergraduate degree in 2001 from Oklahoma State University and his Juris Doctorate Degree in 2005 from Oklahoma City University, Mr. Bays started his own practice in 2007. Mr. Bays has successfully represented clients around the state of Oklahoma in a wide array of legal matters including family, criminal, personal injury, and more. We have developed a good reputation with judges and lawyers across the state and we are committed to professionalism.
Michael Collins Trewitt
Claimed Lawyer Profile
Kay County, OK DUI Lawyer with 36 years experience
(580) 761-2982 1926 Lake Rd, Suite 1
Ponca City, OK 74604
DUI, Criminal, Estate Planning and Traffic Tickets
University of Oklahoma College of Law
Kyle Lee Endicott
Claimed Lawyer Profile
Payne County, OK DUI Attorney with 14 years experience
(405) 743-3770 711 S Husband St
Stillwater, OK 74074
DUI, Business, Criminal and Personal Injury
University of Tulsa College of Law
Kelly Kerr
Claimed Lawyer Profile
Delaware County, OK DUI Attorney
(918) 253-2400 312 South 5th
Jay, OK 74346
DUI and Criminal
Matthew Sheets
Claimed Lawyer Profile
Pittsburg County, OK DUI Lawyer
(918) 558-5580 321 S. Third Street, Suite 12
McAlester, OK 74501
DUI, Criminal, Personal Injury and Traffic Tickets
Jason David Smith Esq.
Claimed Lawyer Profile
Delaware County, OK DUI Attorney with 15 years experience
(918) 253-8900 P.O. Box 19
306 South 5th Street
Jay, OK 74346
DUI, Animal, Criminal and Divorce
Kay County, OK DUI Lawyer
(580) 762-2231 114 N 3rd St
Ponca City, OK 74601
DUI and Criminal
Payne County, OK DUI Attorney
(405) 377-8185 123 W 7th Ave
Stillwater, OK 74074
DUI and Criminal
Oklahoma County, OK DUI Attorney
(405) 848-5400 6402 N. Santa Fe Avenue
Suite A
Oklahoma City, OK 73116
DUI, Criminal and Personal Injury
John Cannon
Claimed Lawyer ProfileQ&ASocial Media
Oklahoma County, OK DUI Lawyer with 8 years experience
(405) 888-7369 600 West Sheridan
Oklahoma City, OK 73102
Free ConsultationDUI, Criminal, Divorce and Military
Judge Advocate General’s Legal Center and School and Oklahoma City University School of Law
Cannon Law Firm, PLLC, is a leading criminal defense and family law firm in Oklahoma City founded by Judge Advocate and former Assistant Attorney General, John P. Cannon. Cannon Law Firm, PLLC, provides experienced legal representation in criminal defense as well as family law matters, including divorce and child custody. I work for clients and their families across Oklahoma.
You need professional legal counsel, if you have been arrested or need a family attorney. Your rights are at stake, you need to speak to an experienced attorney today. Cannon Law Firm, PLLC, is dedicated to helping individual clients and their...
Douglas J. Smith
Claimed Lawyer ProfileSocial Media
Cleveland County, OK DUI Attorney with 28 years experience
(405) 360-2660 104 E. Eufaula St.
Norman, OK 73069
Free ConsultationDUI, Criminal, Domestic Violence and Personal Injury
University of Oklahoma College of Law
Douglas J. Smith, Attorney for the Smith Law Office, P.C. is conveniently located across the street, southwest of the Cleveland County District Court House in Norman, Oklahoma focusing on Criminal Law, DUI/ DWI, Expungement Law, Family Law and Personal Injury cases since 1990. Mr. Smith has earned a solid reputation in the state of Oklahoma with over two decades of law experience and has handled thousands of cases with favorable results. When your future is on the line, you need an experienced and knowledgeable local attorney on your side that will fight for your rights. Let...
Keegan Kelley Harroz
Claimed Lawyer ProfileQ&ASocial Media
Oklahoma County, OK DUI Lawyer with 8 years experience
(405) 568-4318 625 NW 13th Street
Oklahoma City, OK 73103
Free ConsultationDUI, Criminal, Personal Injury and Traffic Tickets
Oklahoma City University School of Law
Harroz Law is a full service law firm in Oklahoma City that is committed to providing quality, ethical and affordable legal representation to our clients. We believe in a whole client approach and as your attorney will strive to serve each client’s individual legal needs. We recognize that when it comes to your legal needs, there is no “one size fits all” solution. Harroz Law has a reputation in Oklahoma City for providing honest, hardworking and aggressive representation to its clients. We represent businesses and individuals in both civil and criminal matters in Oklahoma’s Municipal, State, and Federal courts.
Frank A. Urbanic
Claimed Lawyer ProfileQ&ASocial Media
Oklahoma County, OK DUI Attorney with 3 years experience
(405) 633-3420 1141 N Robinson Ave #101
Oklahoma City, OK 73103
Free ConsultationDUI, Criminal and Domestic Violence
Texas Tech University School of Law
I became a criminal defense attorney because I am intimately familiar with how precious our constitutional rights are. After my arrest years ago, I realized how close I was to being in a situation that could have negatively impacted my life forever. That made me realize how important it is to have someone on your side who feels strongly about protecting your rights. In the Air Force, I put my life on the line to support and defend the Constitution during combat. Today, I support and defend the Constitution in the courtroom. My legal career began by...
Marcy Fassio
Claimed Lawyer ProfileSocial Media
(405) 593-8444 435 N. Walker Ave., Suite 201
Oklahoma City, OK 73102
Oklahoma County, OK DUI Attorney with 13 years experience
DUI, Criminal, Domestic Violence and White Collar Crime
University of Oklahoma College of Law
An Oklahoma native, Marcy Fassio attended the University of Oklahoma and received her Bachelor of Arts degree, cum laude, in 2002. Marcy then was accepted to the University of Oklahoma College of Law, where she graduated and earned her Juris Doctorate With Distinction in 2005. EXPERIENCE – FORMER ASSISTANT DISTRICT ATTORNEY OKC Criminal Defense Attorney Marcy Fassio has practiced criminal law exclusively since completing law school and passing the Oklahoma Bar Examination in 2005. She worked for the Oklahoma County District Attorney’s Office for several years, gaining experience that now can be put to your advantage! She has...
Elton Jenkins
Claimed Lawyer ProfileSocial Media
Cleveland County, OK DUI Lawyer with 20 years experience
(405) 217-3623 115 S. Peters Ave. Suite 6A
Norman, OK 73069
Free ConsultationDUI, Bankruptcy, Criminal and Traffic Tickets
University of Oklahoma College of Law
I'm attorney Elton Jenkins. Since 1999, I have practiced criminal law in Oklahoma. Growing up on the southwest side of Oklahoma City, I saw people close to me face criminal charges. I quickly learned why people accused of a crime need a lawyer on their side.

Throughout my career, I have kept those experiences in mind. While I go to trial more often than many lawyers, I also know that sometimes a reasonable solution involves negotiation. By preparing carefully and presenting my client's case, I am often able to achieve alternative resolutions such as treatment and rehabilitation instead of jail time.

I...
Josh Davis
Claimed Lawyer ProfileQ&ASocial Media
Garfield County, OK DUI Lawyer with 13 years experience
(580) 233-1457 202 West Broadway
Enid, OK 73701
DUI, Criminal, Divorce and Personal Injury
University of Oklahoma College of Law
Josh is a fifth generation Oklahoman with Garfield County roots that stretch back to the opening of the Cherokee Strip. As an Assistant District Attorney in Enid for nearly 5 years, Josh knows what it takes to prosecute a case. Josh left the Garfield County District Attorney's office for private practice as a partner at Martin, Cameron, and Davis in 2011. Since then, he has used his invaluable experience as a prosecutor in his defense of clients charged with a variety of criminal offenses including DUI/DWI/APC, drug possession, violent crimes, and property crimes. Josh is also the only...
Matthew Paul Swain
Claimed Lawyer ProfileSocial Media
Cleveland County, OK DUI Lawyer with 9 years experience
(405) 501-0827 115 South Peters Avenue
Suite 6
Norman, OK 73069
Free ConsultationDUI, Criminal, Family and Personal Injury
University of Oklahoma College of Law
The Swain Law Group specializes in Criminal Defense, Family Law and Civil Litigation cases across Oklahoma, with a focus on the Oklahoma City Metro area, especially Norman, Oklahoma City and El Reno.

With 4 dedicated Criminal Defense attorneys, including 2 former prosecutors, the Swain Law Group is the largest Criminal Defense Firm in Oklahoma. When you hire the Swain Law Group you get 2 attorneys assigned to your case and the entire team of attorneys collaborating on each major decision. My office handles over 200 criminal cases per year all across Oklahoma. We specialize in Drug Trafficking and...
Julia Mills Mettry
Claimed Lawyer ProfileSocial Media
Cleveland County, OK DUI Lawyer with 8 years experience
(405) 701-8856 222 East Main Street
Norman, OK 73069
Free ConsultationDUI, Criminal, Family and Traffic Tickets
University of Oklahoma College of Law
Julia Mills Mettry is an experienced trial lawyer in all areas involving families. From aggressively representing prospective adoptive parents in finalizing a contested adoption to helping family members obtain guardianship over their elderly loved ones, Julia brings a broad and expansive perspective to Allen & Mills. Julia has also placed her primary focus on representation of clients in all aspects of divorce, custody, paternity, and child support cases as well as providing them with estate planning and probate practice. Julia takes the defense of the rights of children seriously and puts their best interests in the forefront which...
Craig M. Hoehns
Claimed Lawyer ProfileQ&ASocial Media
Oklahoma County, OK DUI Attorney with 11 years experience
(405) 535-2005 3801 N Classen Blvd, Suite 250
Oklahoma City, OK 73118
Free ConsultationDUI, Criminal and White Collar Crime
Oklahoma City University School of Law
Brian D Hall
Claimed Lawyer Profile
Cleveland County, OK DUI Lawyer with 12 years experience
(405) 217-2182 115 S Peters, Suite 2
Norman, OK 73069
Free ConsultationDUI, Criminal, Domestic Violence and White Collar Crime
University of Oklahoma College of Law
I have over a decade in Criminal Law experience. I have dealt with criminal matters from DUI and Domestics to Murder in the 1st Degree. I am an experienced negotiator, as well as an experienced trial lawyer. I have Jury Trial and Non Jury Trial experience. I have dealt with thousands of Criminal Cases. Prior to entering private Practice, I was an Assistant District Attorney in District 21 in Oklahoma for over 11 years. This includes Cleveland, Garvin, and McClain Counties. I was the Managing Assistant District Attorney in McClain County for the...
David Chandler Hamel
Claimed Lawyer ProfileSocial Media
(405) 254-2141 1621 N. Classen Blvd.
Oklahoma City, OK 73106
Free ConsultationOklahoma County, OK DUI Attorney
DUI, Criminal, Domestic Violence and Municipal
Oklahoma City University School of Law
David C. Hamel is a Trial Attorney in Oklahoma City, OK. His primary area of practice is criminal defense, but represents clients in many areas of litigation. Mr. Hamel is a graduate of the Trial Lawyers College. Mr. Hamel firmly believes in a comprehensive approach to representing his clients both in and out of the court room.
Sammy Duncan
Claimed Lawyer ProfileSocial Media
(918) 640-4332 1601 N Blackwelder Ave
Oklahoma City, OK 73106
Free ConsultationOklahoma County, OK DUI Lawyer with 4 years experience
DUI, Criminal, Juvenile and White Collar Crime
University of Oklahoma College of Law
Sammy Duncan’s practice focuses on all things criminal law. Sammy most enjoys being in trial, presenting her case in front of a jury. She takes great joy in meeting new clients and getting to know their stories. Sammy worked for over two years at the Oklahoma County Public Defender’s Office, handling every type of case, including trials for Murder in the First Degree, Drug Trafficking, Armed Robbery, and Human Trafficking.

She knows that every case is different and treats each client with the individual attention they deserve. Sammy received her law degree from the University of Oklahoma School of Law and...
Matt Stacy
Claimed Lawyer Profile
Oklahoma County, OK DUI Lawyer
(405) 735-3800 9905 S. Penn Ave
Oklahoma City, OK 73159
Free ConsultationDUI, Criminal, Personal Injury and Traffic Tickets
University of Oklahoma College of Law
Matt is a hardworking attorney that will treat you with dignity and respect while working to complete your case. He is experienced in many areas and can provide you advice or most issues. Matt has developed a large network of experts and can handle your case with efficiency and timeliness. Free consultations!
J. P. Hill
Claimed Lawyer ProfileSocial Media
(405) 628-7007 1601 N Blackwelder Ave
Oklahoma City, OK 73106
Free ConsultationOklahoma County, OK DUI Attorney with 7 years experience
DUI, Criminal, Family and Personal Injury
Oklahoma City University School of Law
James Wesley Todd
Claimed Lawyer ProfileSocial Media
Oklahoma County, OK DUI Attorney with 15 years experience
(405) 231-2112 217 N. Harvey Avenue, Suite 507
Oklahoma City, OK 73102
Free ConsultationDUI, Appeals and Criminal
Tulane University School of Law
Providing clients with dedicated defense of DUI, DWI, APC, Drug charges and general criminal defense.
A. Craig Yarborough
Claimed Lawyer Profile
Woodward County, OK DUI Lawyer with 14 years experience
(580) 254-5553 Woodward, OK 73801
DUI, Criminal, Employment and Family
Oklahoma City University School of Law
Mr. Yarborough has earned a solid reputation in the state of Oklahoma with over two decades of law experience and has represented hundreds of clients with criminal charges both felony and misdemeanor cases including but not limited to Accelerations, Actual Physical Control, Arson, Assault & Battery, Bail Bond Reductions, Burglary, CDS, Domestic Abuse, Drunk Driving, DUI/ DWI, Drug Charges, Intent to Distribute, Juvenile, Manufacturing, Marijuana, Modifications, Molestation, Murder, Possession of Paraphernalia, Prescription Drugs, Rape, Revocations, Robbery, Sex Crimes, Theft, Traffic Violations, and Expungement of Records.
Jeremy Zackary Carter
Claimed Lawyer ProfileSocial Media
Mcclain County, OK DUI Attorney
(405) 392-3300 4717 SW 179th
P.O. Box 255
Newcastle, OK 73065
Free ConsultationDUI, Insurance Claims, Medical Malpractice and Personal Injury
University of Oklahoma College of Law
Jeremy Z. Carter. Born in Shawnee, Oklahoma and raised in Seminole, he is a lifelong Oklahoman whose success has been the result of grace and very hard work. He attended Seminole State College, Oklahoma State University and the University of Oklahoma College of Law. After becoming an attorney, he was trained by the best in the business at a couple of very reputable and successful law firms. He represented insurance companies and multi-national corporations in complex litigation. But after starting a family, he decided it was time to start serving those people close to him and on his own terms. ...
Laura Sams Neal
Claimed Lawyer ProfileSocial Media
(405) 429-3023 1332 SW 89th Street
Oklahoma City, OK 73159
Free ConsultationOklahoma County, OK DUI Attorney with 5 years experience
DUI, Civil Rights, Criminal and Personal Injury
Oklahoma City University School of Law
Mr. Adam R. Banner
Claimed Lawyer ProfileSocial Media
Oklahoma County, OK DUI Attorney
(405) 778-4800 1900 NW Expressway
Suite 603
Oklahoma City, OK 73118
Free ConsultationDUI, Appeals, Criminal and White Collar Crime
Oklahoma City University School of Law
Adam is an experienced Oklahoma criminal defense attorney. He is a member of the Oklahoma Bar Association, the Oklahoma County Bar Association, the Federal Bar Association, the American Bar Association, the National Association of Criminal Defense Lawyers, and the Oklahoma Criminal Defense Lawyers Association. He is licensed to practice in the Supreme Court of Oklahoma and all inferior Oklahoma State courts, the United States District Court for the Western District of Oklahoma, the United States District Court for the Eastern District of Oklahoma, the United States District Court for the Northern District of Oklahoma, the United States Court of Appeals...
Joshua A. Edwards
Claimed Lawyer Profile
Pontotoc County, OK DUI Attorney with 8 years experience
(580) 332-5579 525 S. Mississippi Ave.
Ada, OK 74820
DUI, Criminal, Divorce and Family
University of Oklahoma
Mr. Edwards attended the University of Oklahoma, where he received his Bachelor of Arts Degree with Distinction in Sociology-Criminology in 2007, and his Juris Doctorate with Distinction from the O.U. College of Law in 2010. While in law school, he served as an editor for the American Indian Law Review. He interned at the OU Criminal Defense Clinic and the Oklahoma Indigent Defense System, Capital Post-Conviction Division before moving to Ada, Oklahoma. He is a member of the Oklahoma Bar Association, the Pontotoc County Bar Association, and the Oklahoma Criminal Defense Lawyers Association. He practices criminal...
Michael A. Risley
Claimed Lawyer ProfileSocial Media
Oklahoma County, OK DUI Lawyer with 8 years experience
(405) 265-9273 3700 Classen Blvd, suite 150
Oklahoma City, OK 73118
Free ConsultationDUI, Criminal, Divorce and Domestic Violence
University of Oklahoma College of Law
Michael Risley received his B.A. from the University of Oklahoma in 2005, where he was a Member of the Dean of Arts and Sciences Student Advisory Board and a strong extracurricular supporter of the Anthropology Department. In 2008, at the University of Tulsa College of Law, Mr. Risley was awarded the American Bar Association's Curtin Fellowship for his work in alternative sentencing for homeless defendants. Unable to refuse the call of home, Mr. Risley returned to O.U. in 2009, and received his J.D in 2010. Mr. Risley was born in Singapore to his Norwegian mother and American father, and split his...
Andrea Lea Worden
Claimed Lawyer ProfileSocial Media
Cleveland County, OK DUI Attorney with 12 years experience
(405) 360-8036 109 E. Tonhawa St.
Norman, OK 73069
Free ConsultationDUI, Criminal, Family and Juvenile
Being charged with a criminal case is a stressful time for anyone – both your freedoms and your future are at stake. That’s just one reason why it is so crucial to choose a criminal defense attorney whose primary practice is criminal defense and will give you the personal and professional attention you deserve. We at Worden Law Firm pride ourselves in doing just that. We treat our clients with the utmost respect while providing them with the highest level of legal guidance.
Robert Faulk
Claimed Lawyer ProfileSocial Media
Garfield County, OK DUI Lawyer
(580) 249-9100 118 E Randolph Ave
Enid, OK 73701
DUI, Bankruptcy, Criminal and Personal Injury
Oklahoma City University
Mack Kelly Martin
Claimed Lawyer Profile
Oklahoma County, OK DUI Attorney with 40 years experience
(405) 236-8888 125 Park Avenue
Fifth Floor
Oklahoma City, OK 73102
Free ConsultationDUI, Criminal, Securities and White Collar Crime
Oklahoma City University School of Law
Mack K. Martin's entire career has specialized in criminal defense. He's represented clients and tried cases throughout the State of Oklahoma. Mr. Martin has likewise represented clients throughout the United States, including: California, Colorado, Florida, Illinois, Iowa, Kansas, Michigan, Mississippi, Missouri, Nebraska, Nevada, New Mexico, New York, North Carolina, North Dakota, Texas and Washington, D. C. in State and Federal Courts.
His recognitions and awards include: (1) Oklahoma Criminal Defense Lawyer’s Association Lord Erskine Lifetime Achievement Award in Criminal Defense, 2000; (2) Outstanding Law Review Alumni Award, Oklahoma City University School of Law,...
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Arrested or charged with a DUI or DWI?

Driving under the influence (DUI) means operating a motor vehicle after consuming alcohol or drugs that have impaired a person's mental or motor skills. In most states, a person will be considered "impaired" if they exhibit objective signs of intoxication, or if they have a blood alcohol content of .08 or higher. Many states also have zero tolerance laws for drivers under 21, where any non-zero BAC level constitutes an offense. Most states also hold commercial drivers, such as truck drivers, to a more rigorous standard.

Law enforcement officers use a variety of tests, such as field sobriety tests and breathalyzers, to determine whether a driver is impaired by alcohol. In some jurisdictions, you have a right to refuse some of these tests, but in other jurisdictions you may be required to submit to them. It is important to know the law in your particular state, and to consult a DUI attorney if you are facing charges.

DUI lawyers are criminal defense attorneys focused on representing clients facing DUI/DWI/OWI charges. Each state has different DUI laws. An experienced DUI lawyer will be able to evaluate the case against you and present your options on how to best limit the impact of the charges against you. DUI lawyers also handle related cases such as driver's license reinstatement and DUI record expungement.


Blood Alcohol Concentration (BAC): The percentage of alcohol in a person's blood.

Field Sobriety Test: Any one of several roadside tests that can be used to determine whether a driver is impaired.