I had one sip of whiskey 20 hours before an EtG test for probation, and immediately forced myself to vomit all the contents of my stomach right afterwards upon realizing this. Has anyone else had one shot of hard alcohol this close to an EtG test? If so, what were the results?

The worst thing that could happen is you pass and get the idea you can have a few sips before a test. It was an insane idea and action, including the vomiting. The question should not be whether you pass or fail, because you probably will, but the insane ideas that led to the sip and purging episode. If you learn that lesson and do better, you won't have to worry about passing ANY dope or alcohol tests.

Good luck.