This document presents an alcohol detection and monitoring system with engine locking that is designed to reduce drunk driving accidents. The system uses an alcohol sensor to detect alcohol levels in a driver's breath and will send a signal to a microcontroller to stop the engine and trigger an alarm if alcohol is detected. It also uses a GPS module to track the vehicle's location and a GSM module to send a message with the location to local authorities. The system is intended to automatically detect drunk driving and alert authorities in order to improve road safety.