Being stopped for a suspected DUI can be a scary situation
You may feel like the deck is stacked against you the moment those blue lights flash in your rearview mirror. A DUI charge can make it seem as if the evidence is carved in stone, but the truth is far less set in concrete.
In fact, much of the evidence in a DUI case can be challenged, questioned, or even tossed out entirely. The strongest part of the state’s case might be weaker than it looks. Below, we take a closer look at the kinds of evidence that don’t always hold up when the details are carefully examined.
What types of traffic stops can be challenged?
Every DUI case starts with a traffic stop, and that stop must be supported by a valid legal reason. Police can’t pull someone over based on a guess, a vague feeling, or an assumption. If the stop wasn’t lawful, everything that followed may be at risk.
A traffic stop may be challenged when:
- The officer lacked reasonable suspicion to pull the driver over.
- The reason for the stop doesn’t match what’s shown in dashcam or bodycam footage.
- The stop was based on an anonymous tip that the officer never verified.
Even DUI checkpoints must follow strict guidelines. If a checkpoint wasn’t properly authorized or officers used inconsistent methods when deciding which cars to stop, the entire checkpoint stop may be considered unconstitutional.
When a judge decides that certain evidence doesn’t meet legal or scientific standards, the prosecution may lose key parts of its case. Without reliable evidence, the state may be forced to reduce charges or even dismiss the case altogether.
This is one reason why a detailed review of the evidence is so important. What looks like a strong case at first glance may not hold up once the facts are put under the microscope. The quality of the evidence matters every bit as much as the quantity.
Can field sobriety tests hold up under scrutiny?
Field sobriety tests can look simple on the surface, but they’re not as foolproof as many people think. These tests must be administered correctly and under the right conditions. A misstep by the officer can make the results far less reliable.
Many factors can impact how someone performs on these roadside exercises, including:
- Uneven pavement, weather conditions, or poor lighting
- Age or physical limitations
- Nervousness, fatigue, or medical conditions that affect balance
It’s also worth noting that field sobriety tests are subjective. Officers often rely on their interpretation of the driver's performance, leaving room for error or bias. If video footage tells a different story from the officer’s written notes, that inconsistency becomes important.
Are breath test results always accurate?
Breath test machines seem scientific and precise, but they require careful calibration and proper handling to produce accurate readings. A machine that hasn’t been maintained correctly or used by someone without proper training can lead to misleading results.
There are several ways breath test evidence can be challenged. For example, the machine may not be calibrated in accordance with state requirements. There may be no proof that the officer observed you during the required period before the test.
Additionally, health conditions such as acid reflux and diabetes can artificially inflate readings. Even something as simple as mouth alcohol leftover from a burp or recent dental work can cause a breath test number to spike. When these issues surface, the accuracy of the test can quickly come into question.
Can blood test results be flawed?
Blood tests are often viewed as the “gold standard” in DUI cases, but they aren’t flawless. Blood samples can be contaminated or mishandled, and testing labs can make mistakes that significantly affect results.
Problems with blood test evidence may include:
- A broken chain of custody.
- Improper storage that causes fermentation in the sample.
- Errors by lab technicians that go unnoticed until a DUI defense attorney reviews a case.
If the blood was drawn long after the traffic stop, the timing alone can be used to challenge whether the result reflects the driver’s actual level of impairment at the time they were behind the wheel.
Is officer testimony always reliable?
Police officers are trained professionals, but they are still human. They can misremember details or misinterpret a driver’s behavior. Their credibility can also hinge on whether their statements line up with video evidence or written reports.
Discrepancies often arise when the officer’s memory of the event changes between the arrest and the courtroom. The report could include generalized statements that aren’t backed by specifics. Plus, video footage could contradict the narrative in the officer’s report.
What can dashcam or bodycam footage reveal?
Video evidence is one of the most valuable tools in a DUI case. Bodycam or dashcam recordings can show exactly how the driver behaved, how the officer conducted the stop, and whether the officer followed required procedures. When a video doesn’t match the written account, it opens the door to challenging the entire narrative of the arrest.
Footage can be especially helpful when:
- The driver appears steady, calm, and coherent despite claims of impairment
- The officer’s instructions weren’t clear or consistent
- Key portions of the video are missing or were not properly recorded
Can witness statements support a challenge to DUI evidence?
Not every DUI case relies solely on police observations. Passengers, bystanders, and even restaurant employees who saw the driver before the stop may provide statements that contradict the officer’s claims.
Witness testimony may strengthen the defense when:
- Passengers can explain why the driver appeared unsteady, such as fatigue or injury
- Bystanders recall the driver showing no signs of impairment
- Officers failed to speak with witnesses who were available at the scene
Why does having an experienced DUI defense lawyer matter?
Challenging DUI evidence isn’t about searching for loopholes. It’s about making sure the state meets its burden of proof and follows the law every step of the way. Experienced South Carolina DUI defense attorney Matt Bodman knows how to analyze the details many people overlook, from technical testing issues to constitutional violations.
A strong defense often rests on knowing where the weak spots lie. With the right legal guidance, what once felt like a hopeless situation may turn out to have far more possibilities than you realized.
If you’ve been charged with DUI in South Carolina and want to understand your options, speak with a lawyer who knows South Carolina law and will work tirelessly to build a strong defense.
Matt Bodman has built his practice on scrutinizing the evidence, protecting clients’ rights, and fighting for the best possible outcome in every case. To find out how he can help, complete the online contact form or call for a free consultation.
"Matt was such a blessing! He helped me through my case and was there for me step by step. He gave me his cell phone number and was there when I had a question or concern. I couldn't be more happier with the result of my case, and I wouldn't think twice about calling him to represent me again!" - Actual client, ⭐⭐⭐⭐⭐
