DRUNK DRIVING PREVENTION SYSTEM AND METHOD

A drunk driving prevention system includes a biometric authentication device that performs biometric authentication of a driver step by step when startup of the vehicle is requested, a breathalyzer that measures a drinking level of the driver whose biometric authentication has been completed, a driver monitoring device that monitors the driver's state in a vehicle while a drinking level of the driver is measured, and a controller that allows or blocks startup of the vehicle based on a result of measuring the driver's drinking level, wherein the biometric authentication device adjusts biometric authentication phases for the driver in a case of an exceptional vehicle where a front seat of the vehicle is configured as an independent space.