What is DUI? Florida DUI laws are strict. DUI is an offence to the law, which occurs when someone is driving a vehicle under the influence of a substance which impairs one normal ability to drive a vehicle. This is usually proven by having blood-alcohol levels of 0.08 or higher, or the impairing of normal abilities. Is a DUI a criminal charge? Yes, a DUI is a criminal charge. According to Florida DUI laws, you are breaking the law of operating a motor vehicle with a blood-alcohol level of .08 per cent or more. That means that if your sample blood were taken, .08 per cent of it would be alcohol. It is important to know that your blood-alcohol level may legally be determined by law enforcement by a breathalyzer test. A breathalyzer is a device that can measure alcohol concentrations in a person’s breath. If your alcohol concentrations prove to be above the legal limit, the officer will place you under arrest. If your blood-alcohol leve...