Eastern Iowa Criminal Defense Attorneys
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Defenses to OWI/DUI in Iowa City

Serving Cedar Rapids, Davenport & all of Eastern Iowa

Many people fail to defend themselves against OWI/DUI charges because they erroneously believe the charges against them are open-and-shut. In reality, there are many defenses to OWI/DUI because there are many opportunities for police officers to make mistakes and for equipment to malfunction. The outcome of your case will have a lasting effect on your life. It is in your own best interest to hold the authorities accountable for following proper procedures at every step. Call Keegan, Tindal & Mason today for a free consultation about protecting yourself.

If you have questions about the validity of your traffic stop or the results of your breath test, call (319) 499-5524 to speak to an Iowa City drunk driving defense lawyer.

Decades of Proven Legal Experience

At Keegan, Tindal & Mason, our attorneys have successfully defended many drivers against OWI/DUI charges stemming from procedural mistakes or faulty BAC testing equipment.

Our lawyers can examine the circumstances of your case to determine whether:

  • The police had probable cause to stop your vehicle
  • The police read you your rights
  • The field sobriety or breath test was properly administered
  • The BAC testing equipment was operated and maintained according to protocol
  • Communication requests were denied

Attorney J. Dean Keegan has dedicated himself to understanding the science behind BAC testing and other scientific tools at the prosecutor's disposal.

DataMaster Plagued By Inaccuracies

DataMaster is the only breath test machine approved for use in Iowa, but several issues can render your BAC test results inadmissible and cause the state to drop the charges against you. The operator of the machine must be certified, the machine itself must be certified and calibrated, the test run results need to be recorded properly and the mouthpiece must be changed between tests. Even when these conditions are met, DataMaster is still prone to error.

The machine is essentially a calculator that makes assumptions about you. It cannot differentiate between subtle differences in biomechanics. The state has built assumptions into the machine that benefit the state, not the defendant.

Contact Our Drunk Driving Defense Team

Call now to arrange a free initial consultation in Cedar Rapids or Iowa City. We accept payments by cash, check and credit cards.

Dial (319) 499-5524 now or contact us online and get started on defending your rights.

SUCCESSFUL results for our clients

Protecting Your Freedom & Rights
  • Operating While Intoxicated Record Expunged

    Johnson OWCR106890. Attorney Dean Keegan's client received an Operating While Intoxicated, a serious misdemeanor. After reviewing the videos, Mr. Keegan filed a Motion to Suppress arguing the officer denied his client's right to make a phone call. The State declined to present testimony at the hearing and the Motion to Suppress was granted, making the client eligible for a deferred judgment. Mr. Keegan's client will have her record expunged and be able to obtain a license after 90 days instead of 180.

  • Drug Charge Charge Dismissed

    Johnson County No. OWCR039210, Iowa City, Iowa. Attorney J. Dean Keegan conducted a three-day long suppression hearing which presented the first challenge to the "Drug Recognition Protocols" used in Iowa.

  • Embezzlement No Criminal Charges Filed

    Cedar Rapids, Linn County, Iowa. An employee of a Cedar Rapids business accused of embezzling six million dollars was not charged criminally after the County Attorney agreed to abide by an agreement negotiated by Attorneys J. Dean Keegan and Jerald Kinnamon in which the accused would pay two million dollars to the company.

  • Vehicular Homicide Charge Dismissed

    Johnson County No. FECR058630- Iowa City, Iowa. Attorneys J. Dean Keegan and Jerald W. Kinnamon successfully challenged the withdrawal of blood from a Defendant without his permission after a rollover accident in which a passenger in the vehicle was killed.

  • Vehicular Homicide Charge Dismissed

    Muscatine County No. FECR03718 - Muscatine, Iowa. If convicted of the vehicular homicide while intoxicated, as alleged in this case, the Defendant would have faced the possibility of a 25-year prison sentence, 17 years of which would have to be served before he would be eligible for parole. Following the depositions of the investigating officer and consultation with an accident reconstruction expert, Attorneys J. Dean Keegan and Jerry Kinnamon negotiated the dismissal of Vehicular Homicide as part of a plea

  • OWI Charge Dismissed

    Johnson County No. OWCR083001 - Iowa City, Iowa. Attorney J. Dean Keegan alleged that the Defendant's rights to contact a lawyer or family member may have been violated after his arrest. He requested video of the breath test from the arresting officer to support his allegation. When the officer failed to produce the video evidence in response written requests, a subpoena, and a Motion to Compel, the State conceded the issue and dismissed the offense.

  • OWI Acquittal at Jury Trial

    Johnson County No. OWCR077717- Iowa City, Iowa. Acquittal at jury trial of a defendant accused of Operating While Intoxicated who refused a breath alcohol test. Tried by Attorney J, Dean Keegan.

  • OWI Case Overturned

    State v. Hornik, Segura, et. al.Iowa City, Johnson County, Iowa. When the state of Iowa established that the Datamaster breath testing machine could be used to test subjects being investigated for OWI, it failed to establish a protocol for its proper use. Attorney J. Dean Keegan, in conjunction with the Johnson County Public Defender's Office, mounted a challenge to the use of the machine based on the lack of uniform instructions for its operation.

  • Zero Tolerance Driver's License Revocation Zero Tolerance Driver's License Revocation Overt

    Iowa Dept. of Inspection and Appeals Docket No. 08DOTOW3937. Attorney J. Dean Keegan successfully challenged a "Zero Tolerance" license revocation on the basis that the officer had failed to allow the driver to contact a family member or attorney for legal advice before submitting to the test.

  • OWI 2nd Offense Charge Dismissed

    Muscatine County No. OWCR040280 - Muscatine, Iowa. After Attorney Dean Keegan scheduled the deposition of the State's expert witness in this case, he learned that the breath test was inappropriately administered by the arresting officer. The State dismissed the offense outright and agreed that the breath test result should be inadmissible so the Defendant would not face the proposed one-year administrative revocation of her driver's license.


Opinions That Matter Most 

Reviews from Our Clients
  • He was professional, knowledgeable and prompt. He was very effective in his communication.

    - David
  • I am glad he was there to get my head out of the guillotine when I needed him and keep my record clean.

    - Ryan
  • Attentive and a Standup Guy

    - John

Aggressive, Skillful & Experienced Defense

Learn Why We Are The Leading Criminal Defense Firm In Eastern Iowa
J Dean Keegan, Attorney at Law Qualifications HD

When you need an attorney, calling Dean Keegan, Attorney at Law, can be your first step toward taking back control of your situation and your life. Dean Keegan is the Founding Chair of the Iowa Trial Lawyers Association, Criminal Law Section. He has served on the Executive Board of the Iowa Association for Justice and is a member of the Nation College of DUI Defense and National Association of Criminal Defense Attorneys.