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Rathburn Law Office, P.C. Rathburn Law Office, P.C.

DUI Defense Lawyer in Indianapolis

Science-Driven OWI Defense Built on Forensic Credentials

When your license, livelihood, and freedom are on the line, the quality of your defense depends on how well your attorney understands the evidence against you. At Rathburn Law Office, P.C., we defend Indianapolis OWI cases from the science outward. Chuck Rathburn has spent more than 30 years focused almost exclusively on DUI defense, and that focus runs deeper than courtroom experience alone.

Chuck has been qualified as a forensic expert on breath testing instruments, Standardized Field Sobriety Tests (SFSTs), and alcohol’s effects on the human body by trial and appellate courts in nine states, including Indiana. He purchased a DataMaster evidential breath testing instrument directly from the manufacturer, and he holds instructor-level certification in SFSTs. This means he’s trained to teach the administration and evaluation of the tests to others. He also completed phlebotomy and lab assistant training to develop hands-on knowledge of blood and urine testing procedures.

That depth of technical training isn’t background detail. It’s the foundation of how we build a defense. We serve clients throughout Indianapolis and across Indiana, and we offer free virtual consultations available 24/7.

Book a free virtual consultation with our DUI defense attorneys by contacting us online or calling (463) 465-2401. Available 24/7.

How Instrument-Level Knowledge Shapes Your Defense

Most attorneys challenge breath test results using general arguments. Chuck Rathburn challenges them as someone who owns and has trained on DataMaster evidential breath testing instruments. Because of that training depth and his direct relationship with the manufacturer, he has been invited to teach other attorneys how the DataMaster operates.

That distinction matters because the path to challenging a drunk driving charge runs through the evidence itself. Breath testing devices must be properly calibrated and maintained according to state protocols. In Indiana, law enforcement uses the Intox EC/IR II for evidential breath tests, and the Indiana State Department of Toxicology must inspect and certify each instrument at least every 180 days. Field sobriety tests follow NHTSA standardized procedures, and deviations by the administering officer can undermine the validity of those results. Blood and urine samples are subject to strict chain-of-custody requirements, and failures in collection, storage, or laboratory analysis can make results challengeable in court.

In each case we review, we examine the breathalyzer results, arrest protocols, SFST administration, and blood and urine testing procedures. If the evidence has a weakness, our goal is to find it.

Protecting Your Driving Privileges in Indianapolis

An OWI arrest triggers two separate processes: the criminal case and the administrative action against your license. Both move quickly, and early intervention matters. At Rathburn Law Office, P.C., we work to avert license suspension stemming from Indiana OWI penalties and to seek reduced penalties or alternative sentencing that can preserve your ability to drive.

Indiana’s implied consent law means that refusing a chemical test triggers an administrative license suspension that is separate from the criminal case. A refusal carries a one-year suspension, or two years if the driver has at least one prior OWI conviction. If the charges are dismissed, the driver is acquitted, or the conviction is vacated or reversed on appeal, the remaining suspension must be terminated. Specialized Driving Privileges (SDP) may allow limited driving for work, school, and medical purposes during many OWI-related suspensions, but a suspension based on a chemical test refusal is not eligible for SDP. In those cases, a court may be able to allow driving in a vehicle equipped with an ignition interlock device instead. We help clients understand and pursue those options.

Commercial drivers face compounded stakes. A CDL suspension upon an OWI conviction directly affects the ability to earn a living. Whether you hold a commercial driver license or depend on your personal license for employment and family responsibilities, we treat driving privilege protection as a central part of the defense.

DUI vs. OWI: What Indiana Law Actually Says

Indiana law uses the term Operating While Intoxicated (OWI), not DUI. DUI is informal and widely used by the public and law enforcement, but it doesn’t appear in Indiana statutes or charging documents. What “operating” means under state law matters more than the label, because the definition is broader than most people expect.

“Operating” gives prosecutors more latitude than “driving” does. A person can be charged with OWI even if the vehicle isn’t moving, as long as the State alleges the person was operating it.

Under Indiana law, a person may be considered to be operating a vehicle if they:

  • Are driving the vehicle
  • Are behind the wheel with the engine running
  • Have the ability to put the vehicle in motion

OWI charges can arise when a person is parked, stopped, or not actively driving at the time law enforcement arrives.

Marion County, Indiana · OWI court guide

Inside a Marion County OWI Case: Courts, Deadlines, and Local Rules

Which court gets your case, what the first hearing sets in motion, and the Marion Superior Court rules that shape an Indianapolis OWI case, drawn from the court's published local rules and Indiana's 2026 OWI legislation.

Courthouse
675 Justice Way
Community Justice Campus, Indianapolis 46203
Misdemeanor & Level 6 OWI
1 of 9 courts
Assigned at random under LR49-CR2.2-100
Hire counsel within
10 days
of the initial hearing if charged only with misdemeanors; 20 for a felony
State's discovery due
20 days
after the initial hearing, under LR49-CR00-107

Where an OWI matter lands in Marion County

Marion Superior Court assigns criminal cases at random within two sub-divisions, then moves related matters together. Find your situation in the left column.

Misdemeanor OWI (Class C or Class A) Misdemeanor/Level 6 courts D17, D18, D19, D23, D25, D26, D34, D35, or D36 LR49-CR2.2-100(1)(b)
Level 6 felony OWI The same nine Misdemeanor/Level 6 courts LR49-CR2.2-100(1)(b)
Level 5 or higher felony OWI Major Felony courts D07, D20, D21, D27, D28, D29, D30, D31, or D32 LR49-CR2.2-100(1)(a)
You already have a pending criminal case Generally the court holding your oldest pending case at the highest level LR49-CR2.3-101
On misdemeanor probation and charged with a new misdemeanor OWI Probation case generally moves to the new case's court LR49-CR2.3-101(c)
Driving privileges petition, BMV suspension only Marion Circuit Court LR49-TR3-200(B)
Driving privileges petition tied to the criminal case The court where the charges are pending or the sentence was imposed LR49-TR3-200(B)
Review of a habitual traffic violator determination Marion Circuit Court LR49-TR3-200(H)
Traffic infraction only, no criminal charge Court D33 LR49-TR3-200(C)(6)
Accepted into a problem-solving docket The court overseeing that docket LR49-CR2.2-100(3)

Court designations come from the Marion County local rules. Confirm your court, courtroom, and time on your court notice or on MyCase before you travel.

A Marion County OWI case runs on short local deadlines, from the 10-day window to petition for driving privileges to motion deadlines keyed to the State's witness list. Rathburn Law Office, P.C. can review your case and get those dates on the calendar from the start.

Request a free consultation

Court assignments, local rules, fees, schedules, and judicial personnel change. Confirm details with the Clerk of Marion County or on MyCase before you travel or rely on them. This information is general and is not legal advice for any specific case.

Attorney Charles “Chuck” Rathburn

Charles “Chuck” Rathburn

DUI and OWI defense attorney, Indianapolis

Chuck has handled DUI and traffic cases for more than 30 years. Part of his work happens away from his own cases: he trains attorneys, judges, and law enforcement officers on how breath testing machines accept a sample, analyze it, and report a result.

Qualified as an expert by courts in nine states

Courts in these states have recognized Chuck as an expert on breath testing, the Standardized Field Sobriety Tests, and the DataMaster family of breath testing instruments.

Alaska
California
Indiana
Iowa
Minnesota
Missouri
New York
Ohio
Pennsylvania
Education

Thomas M. Cooley Law School
Juris Doctor, 1991

Southern Illinois University Carbondale
Undergraduate degree, 1984

Technical training

Instructor-level training in the Standardized Field Sobriety Tests

Phlebotomy and lab assistant training in blood and urine testing

Forensic chromatography training

Certification as a Lawyer Scientist

Professional memberships

National Association of Criminal Defense Lawyers
Life Member

DUI Defense Lawyers Association
Member

What clients say

From people Chuck has represented.

Rated 5 out of 5

“He showed compassion and empathy in a town where I felt like a failure. I hands down would recommend him on that alone!”

Kimberly O.Client review

Rated 5 out of 5

“If you’re looking for amazing service, Chuck is the one to go to!”

Ali S.Client review

Rated 5 out of 5

“I highly recommend Charles Rathburn to anyone in need of an attorney who truly cares about his clients and gets results.”

Aubree C.Client review

What the professionals he trains and consults with say

From a breath alcohol testing expert and professionals who have taken Chuck’s breath test training.

“As an attorney, Chuck works hard for his clients and doesn’t just deal cases away. He takes the cases personal and fights to get the best resolution possible.”

Mary M.Breath alcohol testing expert

“Mr. Rathburn did an outstanding job educating my entire staff on the concepts of breath alcohol testing while thoroughly explaining the problems associated with breath alcohol testing.”

Jon S.Arranged DataMaster training for his staff

“Chuck has an intense passion for learning about this machine, and has a gift of how to present it in a format that is easy to digest and understand.”

Eric G.Attended several of Chuck’s DataMaster courses

Read more reviews

Testimonials describe individual experiences. The outcome of any case depends on its own facts, and past results do not guarantee a similar result.

An annual scholarship

Each year the firm awards a $1,000 scholarship to a student attending a college, university, graduate school, or law school, with applications due by the end of the calendar year. See the scholarship details.

Office

Rathburn Law Office, P.C.
8005 Wallingwood Drive
Indianapolis, IN 46256

Available 24/7, with free virtual consultations for clients across Indiana.

Client Experiences and Feedback

    Patient, Knowledgeable
    “If you’re looking for amazing service, Chuck is the one to go to!”
    - Ali S.
    Expertise and Dedication
    “I highly recommend Charles Rathburn to anyone in need of an attorney who truly cares about his clients and gets results.”
    - Aubree C.
    Expertise and Dedication
    “I highly recommend Charles Rathburn to anyone in need of an attorney who truly cares about his clients and gets results.”
    - Aubree C.
    Above and Beyond
    “He showed compassion and empathy in a town where I felt like a failure. I hands down would recommend him on that alone!”
    - Kimberly O.
    Call Chuck!
    “I am always impressed by his knowledge and understanding and ability to think outside of the box.”
    - Mary M.
    Worked Hard to Help
    “Chuck was able to get the DUI dismissed to a lesser charge.”
    - John K.
    Outstanding Job
    “When looking for DataMaster training for my staff, I looked no further than Charles Rathburn.”
    - Jon S.
    Intense Passion
    “I have taken several DataMaster Courses with Chuck and continue to be blown away by both his command of that instrument and his ability to teach it to others.”
    - Eric G.
    Key to Success
    “Understanding the DataMaster better than the DA's and better than may of the State's experts has helped me get some fantastic results.”
    - Mark R.

Defend Your DUI Charge with Forensic-Level Representation

A drunk driving charge in Indianapolis can affect your license, your job, and your record for years. The earlier we can review the field sobriety tests, breathalyzer results, and arrest protocols in your case, the more options we can identify. Rathburn Law Office, P.C. represents first-offense and complex multi-offense OWI cases throughout Indianapolis and Central Indiana. Our approach to every case starts the same way: examine the evidence, challenge what doesn’t hold up, and build a defense strategy specific to your situation.

Don’t let a drunk driving charge define your future. Call (463) 465-2401 or reach out online for a free virtual consultation to discuss your case.

  • Statewide Accessibility
    We represent clients throughout Indiana with virtual consultations that make high-level defense accessible without unnecessary travel.
  • Expert-Level Training
    With advanced forensic education, instructor-level SFST training, and has been qualified as an expert in multiple states, our experience extends far beyond standard courtroom practice.
  • Decades of Experience
    With over 30 years in practice, we bring seasoned judgment and refined strategy to every case, especially when the consequences are serious and long-lasting.
  • Science-Driven Defense
    DUI cases rely on chemical testing and technical evidence. We focus on the science behind the accusation to uncover errors others may overlook.

Start Your Case Review

We offer virtual consultations to review DUI and traffic matters.

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