In Illinois, breath alcohol tests or "breathalyzers" are commonly used to assess a driver's blood alcohol concentration (BAC). If someone's BAC is over 0.08 percent, they are intoxicated per se, or intoxicated according to the law. A BAC over the legal limit is not always required for a drunk driving conviction. However, having a BAC of 0.08 percent or more will certainly make the chances of conviction much more likely.
Many people have questions about the accuracy of breathalyzer tests. They may have heard rumors that these devices can be incorrect or even that diets like the keto diet can lead to higher-than-actual BAC results.