Most impaired driving cases are not won by arguing that the driver was sober. They are won earlier, on whether the officer had a lawful reason to pull the car over, whether the roadside tests were administered the way the training manual requires, and whether the chemical test was performed by a certified operator on an approved instrument under the proper protocol. Each of those is a documented, checkable step, and each is a place where a case can break.
Indiana does not use the term DUI in its statutes. The offense is Operating While Intoxicated, codified at Indiana Code chapter 9-30-5, and the distinction matters because Indiana law reaches operation of a vehicle rather than driving alone. Anyone charged with a DUI in Indianapolis is facing a two-track problem from the first day: a criminal case in Marion County court and a separate administrative action against the driver license. The two move on different timelines, and missing the second while focused on the first is a common and expensive mistake.
What the State Has to Prove
Indiana charges impaired driving two ways, and they are not the same case. A per se charge alleges a blood or breath alcohol concentration at or above 0.08, and it does not require any proof of bad driving. An impairment charge alleges intoxication, meaning impaired thought and action with a loss of normal control, which can be proved by observation alone and can involve alcohol, a controlled substance, or a combination.
| Charge level | Typical trigger | Maximum exposure |
|---|---|---|
| Class C misdemeanor | Operating while intoxicated without endangerment | Up to 60 days |
| Class A misdemeanor | BAC of 0.15 or higher, or endangerment of a person | Up to one year |
| Level 6 felony | Prior conviction within seven years, or a passenger under 18 | Six months to two and a half years |
| Level 5 felony | Serious bodily injury caused while operating intoxicated | One to six years |
| Level 4 felony | Death caused while operating intoxicated | Two to twelve years |
Beyond the sentence, a conviction brings a license suspension, likely ignition interlock, an alcohol and drug program, court costs and fees, insurance consequences through a high risk filing, and a criminal record that surfaces in employment and licensing screens. Any commercial driver faces separate and far harsher federal disqualification rules that a plea in the criminal case cannot undo.
Attacking the Stop
Every case starts with a seizure, and a seizure requires justification. An officer needs reasonable suspicion of a traffic infraction or of criminal activity to stop a vehicle. Random stops without individualized suspicion are unconstitutional, and sobriety checkpoints are permitted only under a structured, supervisor-approved plan that limits officer discretion. Indiana courts also apply an independent reasonableness analysis under the state constitution, which is sometimes more protective than the federal standard.
Defense counsel therefore starts with the dashcam and body camera footage rather than the report. A narrative describing weaving within a lane looks different when the video shows a single lane touch. If the stop fails, everything discovered afterward, including the test result, is generally suppressed, and the case usually ends. Where the alleged conduct is aggressive driving rather than impairment, a related charge such as reckless driving may be on the table as a negotiated alternative.
Attacking the Field Sobriety Tests
The standardized battery consists of three tests validated by federal research: horizontal gaze nystagmus, the walk and turn, and the one leg stand. Their validation depends on administering them exactly as trained, and the scoring is based on counting specific clues rather than on an overall impression. Officers deviate constantly, and the deviations are visible on video.
- Horizontal gaze nystagmus requires a specific stimulus distance, timed passes, and checks for equal pupil size and resting nystagmus; rushing the passes invalidates the observations.
- The walk and turn requires a designated straight line and a reasonably level, dry, non-slippery surface, and it is scored on eight defined clues.
- The one leg stand is scored on four clues and is timed for thirty seconds; roadside conditions, weight, age, and injury all affect it.
- Neither balance test is designed for a person with knee, back, or inner ear problems, and the manual acknowledges the limits.
- Non-standardized tests such as reciting the alphabet backwards or counting fingers have no validation research behind them at all.
Environmental factors get raised for a reason: roadside gravel, sloped shoulders, passing traffic, flashing emergency lights, cold weather, and unsuitable footwear each degrade performance in ways unrelated to alcohol. A defense that pairs the video with the training manual is far more persuasive than one that simply asserts the client was steady.
Attacking the Chemical Test
Breath testing
Breath results are only as good as the process. Indiana requires testing by the approved method on an approved instrument, and the operator must be certified. Defense inquiry focuses on the observation period before the test, during which the subject must not belch, vomit, or place anything in the mouth, because residual mouth alcohol can inflate a reading dramatically. Instrument calibration and maintenance logs, the certification status of the operator, and radio frequency interference are all discoverable. Medical conditions such as gastroesophageal reflux, and physiological states such as diabetic ketoacidosis, are recognized sources of error in infrared measurement.
Timing matters independently. Alcohol absorption continues after the last drink, so a person can be below the limit while driving and above it an hour later at the station. Because the offense is measured at the time of operation, that gap creates a genuine defense in the right facts. The consequences of declining testing are governed by the implied consent statute, and our discussion of breath tests covers the tradeoffs; in Indiana a refusal typically carries a one year license suspension, extended to two years with a prior conviction, and that suspension applies even if the criminal charge is later dismissed.
Blood testing
Blood draws raise constitutional questions that breath tests generally do not. In Birchfield v. North Dakota the Supreme Court held that a warrantless breath test may be taken incident to a lawful arrest, but a blood draw ordinarily requires a warrant or a valid exception. Missouri v. McNeely rejected the argument that the natural dissipation of alcohol always creates an exigency justifying a warrantless draw. Beyond the constitutional issue, blood samples are attacked on preservation grounds: improper preservative or anticoagulant can permit fermentation that raises the measured value, and serum or plasma results read higher than whole blood, so a hospital number used without conversion overstates the legal figure.
How Cases Actually Resolve
- Preserve evidence immediately. Squad video, body camera footage, station video, and dispatch audio are often subject to short retention periods, so a written preservation request goes out first.
- Obtain the full discovery package, including the officer certification, the instrument maintenance and calibration records, and the training manual version in effect.
- File a motion to suppress where the stop, the arrest, or the test process is vulnerable. A granted motion frequently ends the case.
- Evaluate diversion and problem-solving court options, which are available in some Marion County cases depending on record and facts.
- Address driving privileges. Indiana permits a court to grant specialized driving privileges in many situations, including some refusal suspensions, which preserves employment while the case proceeds.
- Negotiate from evidence. A weak test protocol or a questionable stop is what makes a reduction realistic.
For a broader view of the strategic choices involved, see DUI Defense: How Criminal Lawyers Fight Charges and Top Strategies Criminal Defense Lawyers Use to Win Your Case, along with the rest of our Criminal Law coverage.
Frequently Asked Questions
Should I refuse the breath test in Indiana?
There is no universally correct answer. Refusal denies the state a chemical number but triggers an implied consent suspension of one year, or two years with a prior conviction, that applies regardless of the criminal outcome, and prosecutors may argue refusal shows consciousness of guilt. Officers can also seek a warrant for blood. The decision depends on the facts of the individual stop, which is why the practical answer is to ask to speak with a lawyer first.
Can I be convicted if I was parked and not driving?
Possibly. Indiana law addresses operating a vehicle, and courts examine factors such as where the vehicle was located, whether the engine was running, the position of the keys, and whether there is evidence the vehicle moved while the person was intoxicated. Sleeping in a parked car is not automatically a defense, but it is frequently a strong one, particularly where nobody observed movement.
How long does an OWI case take in Indianapolis?
A misdemeanor case that resolves by plea often concludes within three to six months. Cases involving a contested motion to suppress, laboratory discovery disputes, or a felony charge commonly run six months to over a year. Continuances for discovery on instrument maintenance records and expert review are routine and are usually worth the delay when the test process is genuinely in question.
Will a first offense stay on my record?
A conviction becomes part of the permanent criminal record, though Indiana expungement law allows petitions for many misdemeanor convictions after a waiting period, subject to eligibility requirements and a limited number of lifetime petitions. Outcomes that avoid conviction entirely, such as dismissal, acquittal, or successful completion of a diversion agreement, leave a far cleaner record and should be pursued first.
Is it worth hiring a lawyer if the breath test was over the limit?
Usually yes. A number above the limit is a result produced by a process, and the process has documented requirements at every step. Suppression of the stop, gaps in operator certification, observation period failures, and calibration problems all remain available. Even where the reading holds up, counsel affects the sentence, the license outcome, and eligibility for specialized driving privileges.
What to Do Next
Write down everything you remember about the stop while it is fresh: the time of your last drink, what you ate, where the tests were performed and on what surface, what the officer said, and whether you were observed continuously before the breath test. Then get the video preserved in writing before it cycles. That record, made in the first week, is what a defense is built from.
This article is general information about Indiana criminal law and is not legal advice; consult a licensed Indiana attorney about your specific charge.
