Challenging Blood Alcohol Content (BAC) Tests in Out-of-State DUI Cases

Getting pulled over for out of state driving under the influence is stressful enough. But when it happens outside your home state, things can feel ten times worse. You’re far from home, unsure of the local rules, and wondering what this means for your future. If you’ve been charged with a DUI and the police used a blood alcohol content (BAC) test against you, you’re likely asking a big question. Can that BAC test be challenged?

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The answer is yes. And if your case happened outside South Carolina but follows you here, it’s even more important to know your rights. DUI laws might be different across state lines, but your rights as a person remain the same. One of those rights is the chance to question how the state got the evidence they’re using to charge you.

Why BAC Tests Aren’t Always Right

BAC tests are not perfect. They can be wrong for many reasons. Sometimes the person giving the test wasn’t trained the right way. Maybe the machine used was broken or hadn’t been cleaned. Some tests are taken too long after you were driving, which means they don’t tell the full story. Your body also reacts differently to alcohol based on things like weight, gender, health, or what you had to eat. That matters. Also, did the police have a good reason to pull you over? If they didn’t, any test that came after that stop might not hold up in court. That’s why it’s not just about the BAC number. It’s about how they got it and whether they followed the rules.

Out-of-State Arrests Create New Problems

When you’re charged in another state, that state controls what happens next. But South Carolina is part of something called the Interstate Driver License Compact. That means what happens in another state can affect your South Carolina license. You may find your driving rights in trouble back home, even if the arrest happened miles away. Every state has different laws for how BAC tests must be done. What’s allowed in one state might not be okay in another. A mistake made during your arrest—like skipping steps or rushing the test—might be enough to get the results thrown out. If your arrest took place out of state, you may be able to challenge the test using South Carolina’s higher legal standards, especially if that test is now being used to punish you here.

How We Can Push Back Against Bad Tests

There are several ways to fight a BAC test in court. First, we look at how the stop happened. Did the officer have a reason to stop you? If not, everything after the stop might be thrown out. Next, we look at how the BAC test was done. Was the machine used up to date? Was it maintained the right way? Did the officer give the test by the book? Any errors here can call the result into question. We can also bring in witnesses or use scientific evidence to show the test wasn’t right. Maybe you had acid reflux, diabetes, or used a legal mouthwash—things that can change the test result. Maybe you were taken to a hospital, and the blood test was delayed too long to be trusted. Every case has details like these that could work in your favor.

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"John is an excellent DUI attorney. He has received the same field sobriety test training as all police officers in the State, and also the same training as the people who are the instructors of the police officer training courses on field sobriety tests. He is very passionate about DUI's and I recommend him often to people who are facing serious charges in the upstate area."

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Don’t Let One Test Decide Your Future

A DUI charge can make you feel like you’re already guilty. But you’re not. You still have the right to question every part of the arrest, including the BAC test. This is even more true when the test comes from a state with different rules. Don’t assume that just because another state says you were over the limit, that test can’t be challenged. It can. And it should be. Every year, drivers are wrongly charged with DUI because of BAC tests that weren’t done right. It’s not just about protecting your license. It’s about protecting your record, your job, and your name. That’s why you shouldn’t face this alone—especially when you’re fighting an out-of-state charge from here in South Carolina.

Why You Shouldn’t Wait to Get Help

One of the biggest mistakes people make after an out-of-state DUI arrest is waiting. They go home, try to forget about it, and hope it’ll just go away. But it doesn’t. These cases follow you, and delays can make things harder. Witnesses forget things. Camera footage disappears. And the clock keeps ticking on important deadlines. If your license is at risk, you may only have a few days to request a hearing to fight the suspension. Miss that window, and the other state could tell South Carolina to suspend your license, even if you haven’t been convicted yet. Acting fast gives you more options. It also shows the court you’re serious about clearing your name. A BAC test result can seem like strong evidence. But remember, it’s not the whole story. Judges and juries want the truth. If something about the test was wrong, they deserve to know. And if that test is the main proof against you, showing it was flawed can change everything.

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What Makes Out-of-State Cases So Tricky

DUI laws are state laws. That means every state does things a little differently. The legal limit might be the same—usually 0.08—but how that limit is tested, recorded, and challenged varies. In some states, refusing a BAC test brings harsher penalties than in others. Some states allow blood draws without a warrant; others don’t. That’s why you need someone who understands how both systems work. You may also need a lawyer who can work with or coordinate with an attorney from the state where the DUI happened. That takes planning. It takes someone who’s handled this kind of case before. It takes someone who understands how to protect your South Carolina rights while navigating out-of-state rules.

You’re Not Alone in This Fight

If you’re worried about a BAC test from an out-of-state DUI, we understand. It’s scary. It feels unfair. And it can affect every part of your life. But there is a path forward. You don’t have to accept the charge. You can stand up, ask questions, and challenge the test. That’s where we come in. At The Bateman Law Firm, we help people just like you challenge BAC test results—especially in complex, out-of-state DUI cases. Let’s talk about what happened and find the weak spots in the case against you. If there’s a way to challenge that test, we’ll find it. And if there’s a way to help you move forward with less fear and more control, we’ll walk that road with you. Call us today to get the answers you need. You’ve got questions, and we’ve got your back.