Depends on your size and your tolerance to alcohol. It may make you a tad slower.
At least half 5th of alcohol a day
If you have any intention of driving after drinking, do not drive. Any alcohol in your system can mess with your reaction times. A half of a second is all it takes to cause an accident.
The time it takes to pass a breath test after drinking a half pint of alcohol depends on various factors such as your metabolism, weight, and alcohol tolerance. On average, it could take around 1-2 hours to pass a breath test after consuming this amount of alcohol. It's always safest to wait until you are sober before driving or operating machinery.
A breathalyser detects the presence of alcohol in the blood. Alcohol gets into the blood when you drink it. The body processes alcohol at a fixed rate (1 unit, that is 10 ml of pure alcohol, an hour). Therefore if you have consumed 6 units, the breathalyser would still detect the presence of alcohol after 5 hours. If you had just consumed 4 units the breathalyser would not detect alcohol after 5 hours.
Perhaps for a very small child -- say, a two or three year old.
That will depend on a number of factors. Beer varies considerably by alcohol content. A half pint of an IPA could be the same alcohol content as a full pint of a lager. The weight of an individual and the speed they drink it will also factor into the BAC.
My father is a state police man he said it would show up.The ETG test is extremely sensitive, and can detect alcohol from mouthwash. The amount in half a beer would show up for a couple of days at least.
Try and remove the glass immediately in a "good faith effort"
No, diluting alcohol in the system by drinking water 24 hours later will not significantly reduce blood alcohol concentration. The body processes alcohol at a fixed rate, and drinking water will not speed up this process. Time is the only way to decrease blood alcohol concentration as the body metabolizes the alcohol.
Consuming any non-alcoholic beer (misnamed because it contains on-half of one percent alcohol) will result in a positive EtG test.
its on top of the column about half way down