An Indiana DUI case can be challenged by attacking the stop, field tests, chemical testing, alcohol timing, or officer credibility. An arrest does not guarantee a conviction. Each defense depends on the reports, videos, testing records, medical history, and timeline.
Indiana usually calls DUI operating a vehicle while intoxicated, or OVWI. The State must prove every required element beyond a reasonable doubt.
Indiana Code section 9-30-5-1 prohibits operating with an alcohol concentration equivalent of at least 0.08. In plain English, a properly admitted chemical result can support an OVWI charge.
Still, chemical results and police observations are not automatically reliable or admissible. Here are five common ways an Indiana OVWI case may be challenged.
Did the police have a legal reason to stop me?
The first question is simple: Why did the officer stop the vehicle?
An officer generally needs reasonable suspicion that a traffic violation or crime occurred. Common reasons include:
- Speeding
- Improper lane movement
- Driving without headlights
- Failing to wear a seat belt
- Disregarding a traffic signal
The stated reason must be supported by objective facts. An officer cannot legally invent a violation after making the stop.
Dash-camera and body-camera footage can be critical. The video may show that the alleged speeding, swerving, or lane violation never happened.
When a stop was unlawful, a defense lawyer may seek to suppress the resulting evidence. Suppression can prevent prosecutors from using observations, statements, field tests, or chemical results.
Without that evidence, the prosecution may be unable to continue the case.
Can Indiana field sobriety tests be challenged?
Standardized field sobriety tests rely heavily on an officer’s observations. They are not simple pass-or-fail scientific measurements.
Environmental and personal conditions can affect performance, including:
- Cold temperatures
- Wind or rain
- Uneven pavement
- Improper footwear
- Leg, back, or balance problems
- Age or body weight
- Anxiety during the traffic stop
The walk-and-turn test requires precise movements under stressful conditions. The one-leg-stand test requires balance for approximately 30 seconds.
Difficulty completing either test does not necessarily prove intoxication.
The horizontal gaze nystagmus test also depends on proper administration. The officer must position and move the stimulus correctly.
Timing, distance, height, and lighting can affect the officer’s observations. Video may reveal whether the test followed the required procedure.
Can a breath test produce an inaccurate result?
Breath-testing devices require proper maintenance, calibration, and operation. A result may be questioned when any part of that process was mishandled.
A portable breath test used beside the road differs from a certified evidentiary test. Portable devices generally provide officers with preliminary information during an investigation.
Certified breath tests require additional procedures and recordkeeping. The machine’s maintenance history and the operator’s qualifications should be reviewed.
A defense investigation may examine:
- Calibration and inspection records
- The machine’s known margin of error
- The officer’s certification
- The testing sequence
- The time between each breath sample
- Possible medical interference
- Whether the machine reported inconsistent samples
A result close to 0.08 deserves careful review. Even a small testing variation may become important near the legal threshold.
Could my alcohol level have increased after I stopped driving?
Yes. Alcohol does not always enter the bloodstream immediately.
A person’s alcohol concentration may continue rising after drinking ends. This process is sometimes called a rising BAC defense.
The timing matters. Consider someone who consumes several drinks shortly before driving. The alcohol may not be fully absorbed when the vehicle begins moving.
A chemical test taken later could show a higher concentration. That result may not accurately represent the concentration during operation.
Indiana Code section 9-30-6-15 addresses chemical tests obtained within three hours of alleged operation. The statute can create a rebuttable presumption connecting the later result to the earlier driving.
“Rebuttable” means the defense may challenge that presumption with contrary evidence. Drinking history, food consumption, body composition, and testing delays may become important.
A detailed timeline can help evaluate whether alcohol was still being absorbed.
What happens when the police report conflicts with the video?
Officer reports often become the foundation of an OVWI prosecution. Those reports should match the available recordings.
Sometimes, they do not.
A report may describe clear weather when the video shows wind, rain, or fog. It may claim a lane violation that never appears on camera.
An officer may describe slurred speech, poor balance, or obvious confusion. The recording may show normal speech, steady movement, and appropriate responses.
The same issue can arise during field sobriety testing. A report may record repeated mistakes that the video does not support.
These inconsistencies can affect the officer’s credibility. They may also weaken the State’s explanation for the stop, arrest, or testing decision.
Depending on the evidence, the defense may seek suppression, dismissal, negotiation, or a trial.
Does the county where I was arrested affect my case?
Indiana OVWI laws apply statewide, but local procedures can differ.
Cases in Indianapolis, Hamilton County, Johnson County, and surrounding Central Indiana counties may involve different prosecutors, judges, and court practices.
Local scheduling procedures and diversion policies may also vary. The defense strategy should account for both Indiana law and the assigned court.
What should I do after an Indiana DUI arrest?
Do not discuss the facts with police, witnesses, or other potential sources of evidence. Statements can be misunderstood, repeated, or used against you.
Take several practical steps:
- Save every document provided by police or the court.
- Write down the timeline while events remain fresh.
- Preserve receipts, messages, photographs, and location information.
- Avoid posting about the arrest on social media.
- Speak with a defense attorney before making additional statements.
Early preparation can help preserve video, testing records, and other evidence. Some records may become unavailable as time passes.
Speak With the Marc Lopez Law Firm About Your Indiana OVWI Case
Every OVWI case depends on its specific evidence. A lawful defense may involve one issue or several overlapping problems.
The Marc Lopez Law Firm represents people facing DUI and OVWI charges throughout Indianapolis, Hamilton County, Johnson County, and Central Indiana.
To discuss the circumstances surrounding an arrest, call 463-403-1262 to schedule a consultation. Before discussing the case with law enforcement, consider exercising your right to remain silent by pleading the Fifth.
