I am guessing it acts similar to mouthwash or breathe mints in lowering or masking ones BAC when blowing into a breathalyzer. I'm not sure if this actually works, however it is something that is spread around.
Reading up on detecting BAC through the skin (more accurately through a person's sweat) shows that it is possible, but the results take around 2 hours. Based on what I have seen, this sensor would be too complex for just a common hobbyist to develop. You may be able to purchase one and use it in your application, but I doubt you will develop a sensor yourself that trumps this one.
In my state Most of the drivers used cocunut oil before checking the police.So it is very difficult to caught Alcohol used drivers. So i am thinking to develop a sensor for checking through skin.
There are some cheap MQ-3 sensors reactive to alcohol contained in air. I wouldn't expect them to be useful for anything else, but fun. The devices used by the Police need to be certified and regularly calibrated.
A few years ago, the Police (at least in our country) used chemical reaction that changed colour of a stripe included in an inflating balloon inflated by a person to be checked.
However, for precise alcohol measurement (contained in blood), a different method is used. Two samples of blood need to be taken after a while (not sure how the alcohol volume is measured) and then compared to some typical absorption curve to estimate alcohol level at the some specific time.
