Indiana DUI Defense: How to Challenge Impairment Evidence Was it really a DUI, or just an accident? In Indiana, many DUI charges rely on signs of impairment—like stumbling, slurred speech, or red eyes. But are these always proof of intoxication? Not necessarily. In this video, Attorney Marc Lopez breaks down common DUI evidence and why it’s not always reliable. We’ll also discuss how breath and blood tests can be challenged in court, especially since law school doesn’t exactly teach the science