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This test WILL detect alcohol in your system for 72 hours after your last drink. This is a urine test and it will hold up in court if you come up positive. Tehre is now way to get around it. So stop drinking if you have to take a urine test for alcohol. Oh and i know this beucase i run a urine drug testing clinic.
Confidence votes 23.6K. About 72 hours for the urine test. Much longer for the hair follicle test. EtG (ethyl glucuronide) is an alcohol metabolite that remains in your body for several days after the liver has cleared alcohol from the bloodstream.he mouth swab test for alcohol can only test for alcohol from 12  hours back. There is not yet a mouth swab to detect long term  alcohol abuse.