A BAC test shows your Blood achohol content at the time of testing. If you do it at a bar right after your last drink it will read one thing but your BAC will actually continue to rise until all alchohol has been absorbed into your system. You could test yourself think you are legal get pulled and end up with a DUI. That is my issue with no real info available on tests and such. The newer maker of the breathalyzer for use by the police will not even release the methodology used and therefore cannot be independently measured whether it is correct. It has actually led to DUIs being thrown out of court. Those of you who have taken the DUI classes can back me up. The classes are all about how bad drinking is and have nothing to do with actual what is too much or how to judge if you had too much.
Actual I am surprised it is even legal to charge someone with DUI. Because if a guy and girl go out have a few drinks and then have sex but the next morning the girl regrets her decision the law says because she was drinking she did not have the capacity to say yes. But the guy who was drinking apparently has the capacity to know she really didnt want to. But if yopu are at a bar drinking your ability to drive is impaired but the ability to make the decision whether to drive or not isnt impaired.
Funny thing is even cold stone sober I can never really tell what a women wants or means how am I supposed to know after drinking? That is the way of the DUI law, They pass a law but if you ask for specifics they tell you "if you do not know I am not going to tell you" I think women are writing these laws.