Twentynine Palms, California DUI Lawyers

Shaffer T. Cormell
PREMIUM

Free Consultation! Aggressive and Dedicated Representation for DUI Defense!

I am an experienced and focused DUI defense attorney. You can rest assured that I will work hard to protect your rights and interests! Visit my website to see settlements and verdicts. Call now for a free consultation. Read More »
10.0Justia Lawyer Rating for Shaffer T. Cormell View Profile
Michael Bernard Goldstein
PREMIUM

California DUI Attorney with 29 years experience

Western State College of Law at Argosy UniversityCalifornia and Central and Southern District
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Shannon McDonald Goldstein
PREMIUM

California DUI Attorney with 26 years experience

University of the Pacific, McGeorge School of LawCalifornia, Central and Southern District and Federal Court
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Parwana Anwar
PREMIUM

Free Consultation! Skilled and Successful California DUI Defense Lawyer!

I am dedicated to providing each and every client with a skilled and aggressive defense. I will fight to protect your rights and interests! Visit my website for testimonials and results. Call for a free consultation! Read More »
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Robert A. Davis Jr.
PREMIUM

Over 25 years of experience in DUI and DWI defense.

I am an experienced lawyer with a proven track record of aggressive criminal defense. With offices in Temecula and Hemet, I provide services in Riverside, Murrieta, Banning and Indio courthouses. Read More »
10.0Justia Lawyer Rating for Robert A. Davis Jr. View Profile
Sean F. Leslie
Claimed Lawyer ProfileBlawgsearchSocial Media
Palm Desert, CA DUI Attorney with 29 years experience
(760) 579-0380 77564A Country Club Dr
#201
Palm Desert, CA 92211
Free ConsultationDUI, Criminal and White Collar Crime
University of San Diego School of Law
I am a successful criminal lawyer and DUI attorney with over 28 years of experience in the courtroom and experience as a former law enforcement police officer. I am proud to represent those individuals prosecuted by governmental agencies and accused of crimes.

I have been an active member of the California State Bar since 1990 and have been admitted to practice in the United States District Court Southern District of California since 1991. I received my Juris Doctorate Law Degree from the University of San Diego School of Law (USD) in 1990 and graduated from San Diego State University in 1986...
Shaffer T. Cormell
Claimed Lawyer ProfileLII PlatinumSocial Media
(888) 922-5051 255 N D,
Suite #401 - H
San Bernardino, CA 92401
Free ConsultationSan Bernardino, CA DUI Attorney with 28 years experience
DUI, Criminal, Domestic Violence and Traffic Tickets
Simon Greenleaf School of Law - Trinity University Law School
Attorney Shaffer Cormell is a Top Rated DUI/DWI Criminal Defense Attoney in California. He has been representing individuals charged with criminal offenses for over 28 years. You can check out this “Top Rated” California Criminal Defense Lawyer’s reviews at www.avvo.com, Yelp and Google. When you are looking for the Best Criminal Defense Attorney Contact the Law Offices of Shaffer Cormell.

CALL NOW 888-922-5051
John Jimenez
Claimed Lawyer ProfileSocial Media
Palm Desert, CA DUI Lawyer with 43 years experience
(760) 345-4777 77760 Country Club Dr
Suite H
Palm Desert, CA 92211
Free ConsultationDUI, Criminal, Domestic Violence and White Collar Crime
University of California - Berkeley
John Jimenez is a graduate of the most prestigious law school in the country, the University of California, Berkeley (Boalt Hall School of Law), where he received his Juris Doctor degree in 1976. He has over 39 years of experience defending the accused; always practicing as a criminal defense attorney. In his career dedicated to helping the accused, John Jimenez has obtained Not Guilty Jury Verdicts in murder, drug, DUI, sex, theft, domestic violence and white-collar crime cases. Because of his success, John Jimenez’s peers have rated him one of the Best Lawyers in the country, and specifically...
Thomas Murray Derryberry
Claimed Lawyer Profile
Desert Hot Springs, CA DUI Lawyer with 17 years experience
(760) 329-3695 66350 Pierson Blvd
Desert Hot Springs, CA 92240
Free ConsultationDUI and Criminal
William Howard Taft University
Stephanie Arrache
Claimed Lawyer ProfileSocial Media
Palm Desert, CA DUI Attorney
41865 Boardwalk
Suite 202
Palm Desert, CA 92211
Free ConsultationDUI, Criminal, Juvenile and Traffic Tickets
Chapman University Fowler School of Law
Stephanie M. Arrache is an attorney who prides herself on her personal attention to each client and case. She practices exclusively in the field of criminal defense, handling all aspects from infractions to misdemeanors and felonies.
Jessica Jimenez
Claimed Lawyer ProfileSocial Media
Palm Desert, CA DUI Attorney with 10 years experience
(760) 898-0205 77760 Country Club Drive, Suite H
Palm Desert, CA 92211
Free ConsultationDUI, Criminal and Domestic Violence
University of California - Davis
Criminal defense attorney in Palm Desert, California
Brian Russell Michaels
Claimed Lawyer ProfileSocial Media
Indio, CA DUI Lawyer with 23 years experience
(760) 902-0592 42886 Hideaway Street
Indio, CA 92203
Free ConsultationDUI, Criminal, Domestic Violence and Traffic Tickets
University of LaVerne
Attorney Brian Michaels is a 23 year veteran of the California Criminal Courts. Attorney Michaels spent the first 8 years of his career as a big city Prosecutor where he cut his teeth in the trial courts of Los Angeles where he earned accolades as a Top Prosecutor. Attorney Michaels worked for the Los Angeles Police Department during the height of the infamous Rampart Scandal as a Civil Defense Attorney. Michaels is unique among Criminal Defense Attorneys in Southern California as very few have any Prosecutorial experience and most set out on their own straight out of Law School. Michaels...
Michael J. Kennedy
Claimed Lawyer Profile
Yucca Valley, CA DUI Lawyer with 37 years experience
(760) 228-0027 56244 Papago Trail
Suite 7
Yucca Valley, CA 92284
Free ConsultationDUI, Appeals, Criminal and Traffic Tickets
Southwestern University School of Law
I have been a constitutional defense attorney for over 30 years [after serving a few years as a federal judicial law clerk and as a deputy district attorney], 13 of which were as a deputy public defender for San Bernardino County, after which I retired and helped form Ledger & Kennedy, which evolved into Kennedy & Roe at the beginning of 2007, which I dissolved in August of 2012 and commenced my current sole practice.

I concentrate exclusively on criminal and constitutional litigation, and I have handled every manner and nature of criminal case, from infractions to LWOP murders.

I am...
Miguel A. Valente
Claimed Lawyer ProfileSocial Media
Indio, CA DUI Lawyer with 11 years experience
(760) 863-2161 82850Highway 111
SUITE A
Indio, CA 92201
Free ConsultationDUI, Bankruptcy, Criminal and Traffic Tickets
Mario Rodriguez
Claimed Lawyer Profile
Indio, CA DUI Lawyer with 39 years experience
(760) 347-7771 45841 Oasis St
Indio, CA 92201
Free ConsultationDUI and Criminal
UCLA School of Law
Mario Rodriguez received his Bachelor of Arts degree from the University of California at Los Angeles (UCLA) in 1977. He graduated from the UCLA School of Law in 1980, receiving the degree of Juris Doctor. He was admitted as an attorney in California in 1980. An experienced trial attorney, Mario Rodriguez has been a criminal defense attorney for 30 years. He represents clients charged with serious felonies in both State and Federal Court throughout the United States. One hundred percent of Mr. Rodriguez 's practice is defending individuals and businesses in the area of Criminal Law. The investigating agencies...
Antonio Arturo Cota
PREMIUM

Free Consultation! Skilled & Passionate California DUI Defense Attorney!

I am an experienced California defense lawyer. I aggressively defend the accused against DUI charges. I will fiercely fight for your rights! See my website for reviews and case results. Call for a free consultation. Read More »
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Ambrosio E. Rodriguez
PREMIUM

California DUI Lawyer with 21 years experience

Ambrosio E. Rodriguez is a criminal defense attorney with over 18 years experience. Prior to becoming a criminal lawyer, Ambrosio served as a prosecutor for 13 years. During his time as a prosecutor, he led the sex... Read More »
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Shannon McDonald Goldstein
Claimed Lawyer ProfileLII Gold
Palm Desert, CA DUI Attorney with 26 years experience
(760) 772-4278 77564 A Country Club Dr
#118
Palm Desert, CA 92211
Free ConsultationDUI, Criminal, Domestic Violence and Traffic Tickets
University of the Pacific, McGeorge School of Law
Michael Bernard Goldstein
Claimed Lawyer ProfileLII Gold
Palm Desert, CA DUI Attorney with 29 years experience
(760) 772-4278 77564 A Country Club Dr
#118
Palm Desert, CA 92211
Free ConsultationDUI, Criminal, Domestic Violence and Traffic Tickets
Western State College of Law at Argosy University
John Jimenez
Claimed Lawyer Profile
Palm Desert, CA DUI Lawyer with 42 years experience
(760) 345-4777 77760 Country Club Dr Ste H
Palm Desert, CA 92211
Free ConsultationDUI and Criminal
UC Berkeley School of Law Boalt Hall
Denise Elaine Shaw
Claimed Lawyer Profile
Palm Desert, CA DUI Attorney with 25 years experience
(760) 808-9901 78206 Varner Rd
Ste D #282
Palm Desert, CA 92211
Free ConsultationDUI, Criminal, Domestic Violence and Juvenile
California Western School of Law
John Wesley Burdick
Claimed Lawyer Profile
Yucca Valley, CA DUI Attorney with 36 years experience
(760) 365-0741 7355 Church St
Yucca Valley, CA 92284
DUI and Criminal
Thomas M Cooley Law School
Thousand Palms, CA DUI Attorney with 48 years experience
(760) 343-3337 74691 Gaucho Way
Thousand Palms, CA 92276
DUI and Criminal
Georgetown Univ Law Ctr
Indio, CA DUI Lawyer with 23 years experience
(760) 393-2433 46200 Oasis St Dept 2E
Indio, CA 92201
DUI, Criminal, Divorce and Personal Injury
Western State Univ COL
Indio, CA DUI Attorney with 18 years experience
(760) 863-8216 82995 US Highway 111 Ste 101
Indio, CA 92201
DUI and Criminal
Univ of San Diego School of Law
Rancho Mirage, CA DUI Lawyer with 52 years experience
(760) 328-7661 355 Wimbledon Dr
Rancho Mirage, CA 92270
DUI, Business and Criminal
Boston Univ School of Law
Yucca Valley, CA DUI Attorney with 43 years experience
(760) 365-3666 56244 Papago Trl Ste 7
Yucca Valley, CA 92284
DUI, Criminal and Personal Injury
Univ of Montana School of Law
Domingo Castillo Jr
PREMIUM

Facing a DUI/DWI? Experienced attorney can help. Call for a free consultation!

I’m an experienced San Diego DUI/DWI defense lawyer and represent clients in all types of DUI and DWI cases. I will vigorously fight for your rights and help you through every stage of your case. Read More »
10.0Justia Lawyer Rating for Domingo Castillo Jr View Profile
Palm Desert, CA DUI Lawyer with 23 years experience
(760) 779-1824 77711 Flora Rd # 314
Palm Desert, CA 92211
DUI, Criminal, Divorce and Family
Western State Univ COL
Indio, CA DUI Attorney with 41 years experience
(760) 863-4555 45-149 Smurr St Ste A
Indio, CA 92201
DUI, Criminal, Medical Malpractice and Personal Injury
San Fernando Valley College of Law
Yucca Valley, CA DUI Lawyer with 45 years experience
(760) 365-8888 7355 Church St
Yucca Valley, CA 92284
DUI, Criminal, Divorce and Personal Injury
Western State Univ
Indio, CA DUI Lawyer with 38 years experience
(760) 899-1110 82500 Us Highway 111 Ste 5
Indio, CA 92201
DUI, Criminal, Divorce and Personal Injury
San Fernando Valley College of Law
Bermuda Dunes, CA DUI Attorney with 40 years experience
42311 Sandy Bay Rd
Bermuda Dunes, CA 92203
DUI and Criminal
Southwestern Univ School of Law
Dale S. Gribow
Claimed Lawyer ProfileQ&ASocial Media
Palm Desert, CA DUI Lawyer with 49 years experience
(760) 837-7500 73-061 El Paseo Suite 220
Palm Desert, CA 92260
Free ConsultationDUI, Criminal, Personal Injury and Real Estate
Loyola Law School
Boutique practice in Palm Desert for 25 years "A TOP LAWYER FOR ACCIDENT AND DUI CLIENTS"
“TOP LAWYER” - Palm Springs Life-(DUI/PI)-2011-19
“TOP LAWYER”- Inland Empire Magazine Nov. ‘16
PERFECT 10.0 AVVO Peer Rating
“PREEMINENT” Rating - Martindale Hubbell Legal Directory
“BEST Attorneys of America” Selected by “Rue” Limited to Top 100 Attys/state
CALIFORNIA'S TOP 10 ATTORNEYS
TOP ATTORNEYS North America
10 BEST ATTORNEYS For California
Legal Eagle "Best and Brightest Legal Minds" by Palm Springs Life- June 2016
Man of the Year 7 times- including the City of Palm Desert and the City of Hope.
Dale Gribow Day proclaimed 4 x’s.

Michael Paul Ehline
Claimed Lawyer ProfileSocial MediaResponsive Law
San Bernardino, CA DUI Lawyer with 14 years experience
(888) 400-9721 198 N Arrowhead Ave
#20
San Bernardino, CA 92408
Free ConsultationDUI, Elder, Personal Injury and Products Liability
UWLA
Getting banged up in a Los Angeles accident can happen at any time. You could also have an injury at sea on a floating city like a cruise ship. Your injuries could occur in any other city or town in California. It may be from the neglect of some another entity, or individual's negligence. Their failure to exercise due diligence or foresight means that you are entitled to receive compensation for the injuries and other damages you incurred. Whether you're involved in an auto collision, motorcycle accident, pedestrian run down. You're emphatically urged to obtain sharp, expert legal services of...
John Murray
Claimed Lawyer ProfileSocial Media
Rancho Cucamonga , CA DUI Lawyer with 13 years experience
(909) 483-2814 3200 Guasti Rd
Suite 100
Rancho Cucamonga , CA 91761
DUI, Criminal, Domestic Violence and White Collar Crime
Ventura COL
John Murray has amassed a string of case dismissals, not guilty verdicts and "D.A. rejects" in cases ranging from misdemeanor DUI to very serious felonies. He works closely with his clients, and his carefully chosen private investigators and experts, to build the strongest defense in each case.

The National Trial Lawyers Association has awarded John as one of the "100 Best" criminal defense attorneys. The National Advocacy for DUI Defense placed him on their list of the nation's top DUI lawyers. And the American Institute of Criminal Law Attorneys has honored him as one of the 10 best...
Lawrence Taylor
Claimed Lawyer ProfileBlawgsearchSocial Media
Riverside, CA DUI Lawyer with 49 years experience
(888) 777-3449 7121 Magnolia Avenue
Riverside, CA 92504
Free ConsultationDUI
UCLA School of Law
Guided by the nationally-renown "Dean of DUI Attorneys", The Law Offices of Taylor & Taylor is a 4-attorney firm specializing in DUI defense exclusively since 1979, and maintains offices in Long Beach, Beverly Hills, Pasadena, Irvine, Riverside and Carlsbad. A former Marine and graduate of the University of California at Berkeley (1966) and the UCLA School of Law (1969), Mr. Taylor served as deputy public defender and deputy district attorney in Los Angeles before entering private practice. He was the trial judge's legal advisor in People vs Charles Manson, was Supreme Court counsel in the "Onion Field" murder case,...
Robert Louis Miller
Claimed Lawyer ProfileQ&ASocial Media
Rancho Cucamonga, CA DUI Lawyer with 24 years experience
(877) 568-2977 3350 Shelby Street
Suite 200
Rancho Cucamonga, CA 91764
Free ConsultationDUI, Criminal, Estate Planning and Personal Injury
Western State Univ COL
Attorney Robert Miller has a 10.0 Avvo rating, and has been designated a “Client’s Choice DUI Attorney.”

He was named by clients as a top Orange County DUI Lawyer on Yelp, receiving Yelp’s highest rating award, based on reviews.

Mr. Miller has 23 years practicing law in Orange County, including at other criminal defense and DUI firms and practices with his own firm.

Robert Miller has been the author or co-author of three books on DUI defense and has appeared on television and radio as a legal commentator.

He has successfully handled thousands of cases and has many positive...
Eric J Youngquist
Claimed Lawyer ProfileQ&ASocial MediaResponsive Law
Rancho Cucamonga, CA DUI Lawyer with 11 years experience
(909) 472-9112 7211 Haven Avenue E225
Rancho Cucamonga, CA 91701
Free ConsultationDUI, Criminal, Domestic Violence and Juvenile
Western State University College of Law
With approximately 20 years of former Law Enforcement and over 9 years practicing Criminal Defense in California , I possess a unique approach to obtaining positive results for my clientele. Having been born and raised in the local area, educated, and practiced law here, have given me excellent background information to dispense.
Bobby Shamuilian
Claimed Lawyer ProfileSocial Media
Rancho Cucamonga, CA DUI Lawyer with 6 years experience
(909) 340-2000 9798 E Foothill Blvd Suite C
Rancho Cucamonga, CA 91730
Free ConsultationDUI, Criminal, Domestic Violence and White Collar Crime
University of La Verne College of Law
Attorney Bobby Shamuilian is a diligent and aggressive advocate for his clients. His passion is applied to every single case and he works tirelessly to meet the legal objectives of his clients. Bobby is an attorney that you can trust, an attorney that has the knowledge and experience which can help you in your legal matter.

Bobby was raised in Southern California and completed his undergraduate education at the California State Polytechnic University Pomona in finance, real estate, and law. He received his Juris Doctorate from the University of La Verne College of Law finishing at the top of his class...
Graham Douglas Donath
Claimed Lawyer Profile
(951) 667-5293 4229 Main St. Ste 1
Riverside, CA 92501
Free ConsultationRiverside, CA DUI Lawyer with 13 years experience
DUI, Criminal, Domestic Violence and White Collar Crime
University of California Hastings College of the Law
Dedicated exclusively to the defense of those who have been criminally accused throughout Southern California. Attorney Graham D. Donath is an award winning criminal defense attorney who personally sees that his clients get the very best in each and every one of their matters. Mr. Donath is a Certified Specialist in Criminal Law by the California State Bar Board of Legal Specialization, and has successfully defended clients in all types of criminal matters ranging from first time DUI all the way up to capital murder and everything in between.
Paul Samuel Geller
Claimed Lawyer ProfileSocial Media
Rancho Cucamonga, CA DUI Attorney with 19 years experience
(909) 235-6822 8241 White Oak Avenue
Rancho Cucamonga, CA 91101
Free ConsultationDUI
Southwestern University School of Law
Former Deputy District Attorney, Criminal Defense for over 13 years. Persistence, dedication, professionalism. Building on a solid, strong reputation with Judges, Prosecutors, and other Defense Lawyers allows Mr. Geller to communicate and relate well to juries, and obtain dismissals, reductions, and top notch criminal defense results for his clients.
Nicolai Cocis
Claimed Lawyer ProfileSocial Media
Murrieta, CA DUI Lawyer with 19 years experience
(951) 695-1400 38975 Sky Canyon Dr., # 211
Murrieta, CA 92563
Free ConsultationDUI, Criminal, Juvenile and White Collar Crime
University of the Pacific, McGeorge School of Law
Voted as 2018 "Attorney of the Year" by the Southwest Riverside County Bar Association.

Since 1999, I have successfully represented several hundred people charged with Criminal Offenses including DUI and Juvenile Matters. Due to my reputation for integrity and straightforward, honest and ethical defense strategies, my negotiating tactics to dismiss or reduce charges are taken seriously by prosecutors and judges. I will do everything that is ethically possible to challenge probable cause and protect the best interests of my clients. My office is located near the Southwest Justice Center in Murrieta and I represent individuals from the surrounding cities of...
Joseph Vincent Camarata
Claimed Lawyer ProfileSocial Media
Temecula, CA DUI Attorney with 16 years experience
(951) 225-1540 41951 Remington Ave.
Suite 210
Temecula, CA 92590
Free ConsultationDUI, Criminal, Divorce and Family
University of the Pacific, McGeorge School of Law
Joseph V. Camarata prides himself on providing more personalized, experienced representation to clients facing criminal charges and family law matters. Mr. Camarata is a former prosecutor with substantial trial experience. When you discuss your case with him, he provides only his honest assessments and carefully explores your options in detail with you. He is aggressive in seeking the best possible outcome yet compassionate when guiding you through the legal system. Mr. Camarata is highly respected by the legal community for his ethics and for his impressive results.
With over 15 years of legal experience, Attorney Joseph V. Camarata has spent the...
Ronald Dowdy
Claimed Lawyer Profile
Needles, CA DUI Attorney with 5 years experience
(760) 326-0686 121 F St Ste C
Needles, CA 92363
DUI, Business, Cannabis Law and Personal Injury
Robert A. Davis Jr.
Claimed Lawyer ProfileLII GoldBlawgsearchSocial Media
(951) 652-9000 1001 E Morton Pl
#A
Hemet, CA 92543
Hemet, CA DUI Attorney with 27 years experience
DUI, Business, Criminal and Domestic Violence
Brigham Young University
As a founding partner at the firm of Davis Wojcik Duarte, APLC, Riverside County attorney Robert A. Davis works on both criminal and civil cases. He has over 22 years of experience in the legal field. Mr. Davis has been involved with the boards of the Hemet Hospital Foundation, the Exchange Club, and the Education Foundation. He is a member of the California Society of Healthcare Attorneys, American Health Lawyers’ Association and Riverside County Bar Association. He received his Juris Doctor from Brigham Young University, where he was Editor-in-Chief of the Journal of Law and Education. Contact his firm for...
Daniel Jai Tripathi
Claimed Lawyer ProfileSocial Media
Riverside, CA DUI Lawyer with 12 years experience
(877) 422-5297 4192 Brockton Avenue, Suite 100
Riverside, CA 92501
Free ConsultationDUI, Criminal, Domestic Violence and Personal Injury
Southwestern Law School
Versatile trial attorney offering a solid track record of litigation success and experience in various facets of the law. Motivated and articulate professional who thrives in courtroom settings, excels at client rapport, discovery and deposition. Exceptional skill in drafting, reviewing, and analyzing pleadings, motions, responses to summary judgments, opinions, briefs and other legal documents. Recognized as leading defense attorney in Southern California, particularly skilled at “connecting” with and building rapport with jurors, resulting in positive verdicts in vast majority of nearly 20 jury trials, and hundreds of misdemeanor cases. Reputation as a “no nonsense” attorney and aggressive litigator among the...
Richard Wagner
Claimed Lawyer ProfileSocial Media
Rancho Cucamonga, CA DUI Lawyer with 20 years experience
(714) 721-4423 9431 Haven Avenue
Ste., #100
Rancho Cucamonga, CA 91730
Free ConsultationDUI and Criminal
Chapman Univ School of Law
Richard Wagner began his legal career in 1998 as a criminal DUI prosecutor in Los Angeles. While a Deputy City Attorney for Los Angeles, Richard Wagner prosecuted thousands of criminal cases, including DUI, drunk driving, domestic violence, assault and battery, and firearms cases in downtown LA. Since 2002, Richard Wagner has been a DUI Criminal Defense attorney in private practice. In 2006, he presented a lecture, “What to Do If You Are Arrested for Drunk Driving” at Whittier Law School. In addition to giving lectures, Richard Wagner, ESQ. has shown his dedication to the profession of DUI defense by...
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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.