How Long Can Alcohol be detected in my system?

Alcohol itself will not be detected for more than 24-48 hours.   If they run an ETG (ethyl glucuronide) test, it can go back 80 hours, but is more costly.    If you are on probation with an alcohol restriction, be aware it may be detected as long as 3 1/2 days after drinking with an ETG test.  Alcohol will not be detected in a hair follicle test.