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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.
Report Abuse. 1  Water is a clear liquid and that's what you should probably stick with. 2  I definatly wouldn't! 3  Usually the doctor asks you to fast about 12 hours before the colonoscopy is performed.  No, you can't have any alcohol the night before this procedure. You don't want to take any chances of having a reaction when they put you to sleep to do the procedure. jackie_jabar Â· 9 years ago.