Driving Under the Influence (DUI) laws in the United States are designed to penalize drivers who operate vehicles while impaired by alcohol, drugs, or both, with each state setting its own legal blood alcohol concentration (BAC) limit, typically at .08%. A DUI conviction can lead to a range of penalties including fines, license suspension, mandatory alcohol education or treatment programs, community service, probation, and even jail time, with penalties escalating for repeat offenders or incidents involving injury or death. Additional consequences might include increased insurance rates, installation of an ignition interlock device, and a criminal record which can impact employment and travel. Law enforcement uses sobriety tests and chemical tests to determine impairment, and the legal process can involve license hearings, plea negotiations, and trials where the burden is on the prosecution to prove the driver was operating a vehicle while intoxicated.