Numerous factors influence how long it takes for alcohol to work it’s way out of the body. Your age, weight, metabolism (liver & kidney function), prescription and other drugs, what you’ve been eating and when you last ate as well as how fast you were drinking and when you last drank. Even the type of alcohol makes a difference.
Most of us cant afford to guess what our blood alcohol levels are, the consequences are simply too great.
19% of all UK drink drive convictions happen the morning after. Invariably these drivers were expecting that the alcohol they consumed had been cleared from their blood.
Many factors have contributed to a rise in these prosecutions, including larger restaurant and pud wine measures (now up to 350ml) A trend to stronger premium beers and largers. Extended licensing hours and 24 hr supermarket “off licenses” offering low cost alcohol.
You will not find reliable tables of indicators of how high your blood alcohol will be after a set volume of alcohol, or how fast the alcohol will be cleared. They do not exist due to the multiple variables listed above.
Estimating the affect of alcohol is dangerous. Blood alcohol levels and the resultant brain function/impairment are variable and unpredictable. The combination of other depressive drugs such as benzo, barbs, opiates and even Cannabis can significantly impair congnitative skills, so alcohol should never be considered in isolation.
By its very nature, alcohol impairs the brains ability to make a reliable judgement of ability or intoxification. This impairment is clearly still in place while the blood alcohol remains elevated and can last for many hours after drinking has stopped.
Avoid drinking into the small hours.
Do not drink for at least 10 hrs before testing for zero BAC
Employ reliable simple zero tolerance testing before considering driving such as 0.02%BAC breath alcohol detectors.
Do not drive if any hangover affects persist, even if BAC is negative, performance will still be impaired
BAC = Blood Alcohol Concentration