This alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC.
Please review the datasheet for conversions to ppm then Wikipedia.org for BAC.

Features:

•   - 5V DC or AC circuit
•   - Requires heater voltage
•   - Operation Temperature: -10 to 70 degrees C
•   - Heater consumption: less than 750mW

Dimensions:

•   - 16.8mm diameter
  
•   - 9.3 mm height without the pins