How Long Does Alcohol Take To Be Out Of Your System To Pass A Breathalyzer?

There are many variables that play a part in the metabolism of alcohol, some being weight, gender, alcohol use history, amount consumed over what duration.  Given that the consequences of drunk driving are harsh and it is also dangerous I would invest in a pocket Breathalyzer which are under $20.  The "old school" rule was that it takes one hour for 8-ounces of an alcohol beverage to be metabolized by the liver, but take it from me that does not apply to everyone.  I can have two glasses of wine over a two hour duration and be legally impaired.  Better to be safe than sorry.  I learned the hard way.