will a swallow of beer make you fail an EtG test

Your expressions "swallows" and "mouthful" are meaningless. Thanks for thinking of me. Can't help.

When I say two swallows, im saying I drank from the can twice thats its. And when I said not a mouthful of wine it means it was just enough to taste, my concern is the fact that some went down my throat

I doubt that it will show up but you're in the time range where it is possible if a 100ng cutoff is used. Shouldn't be a problem at 500. EtG peaks at about 3-5 hours post-consumption and then declines rather rapidly.

It is important to realize that even small amounts of alcohol, such as one may be exposed to incidentally, does create EtG and at a cutoff of 100ng can be detected in a urine test. (see Thierauf, 2009) Detection is mostly a matter of timing. EtG is detectable only for a brief period (at peak value) due to small amounts of alcohol. Unless you are unfortunate enough to test within that critical period, as noted above, then it is unlikely that EtG will be at a level that can be detected.

Thank You Dr. Bill