Does one beer show up on a EtG test after 80hrs

ETG, not a very reliable test to start with, claims it can show alcohol consumption witin the past 3.5 days, you do the math. One beer depending on size and strength factored in with body mass will not likely show conclusive evidence

No it should not show up, there are many items that can cause a false test reading.

Of course if you are being tested, it is for child custody, probation? Obviously you are not suppose to be drinking, why are you risking the result of failure. I would be more concerned over someone calling and turning me in, that is how most people are caught