DUI laws, or Driving Under the Influence laws, are regulations that prohibit operating a vehicle while impaired by alcohol or drugs. Each state has its own legal blood alcohol concentration (BAC) limit, typically set at 0.08% for adults. Penalties for violating these laws can include fines, license suspension, and even jail time. In addition to alcohol, DUI laws also cover the use of illegal drugs and prescription medications that impair driving ability. First-time offenders may face different consequences than repeat offenders, which can include mandatory education programs and community service. Understanding these laws is crucial for safe driving.