AFAIK, the final test, which is used in court, is a BAC test taken directly from a blood sample. This level is then extrapolated back to the time of arrest, assuming a standard rate of metabolism. So, while you can claim that you recently took cold medicine or gargled with listerine or even had a shot of brandy, the truth will out in the end.
To give you an example of just how drunk BAC levels this high make you, check out this web site:
Specific Effects Related to BAC
This table puts these pilots very firmly in the
"Slight impairment of balance, speech, vision, reaction time, and hearing. Euphoria. Judgement and self- control are reduced, and caution, reason and memory are impaired" category and bordering on the
"Significant impairment of motor coordination and loss of good judgement. Speech may be slurred; balance, vision, reaction time and hearing will be impaired. Euphoria. It is illegal to operate a motor vehicle at this level of intoxication"
Obviously parameters vary between different people, but the BAC registered equates to about 3 or 4 shots drunk in the space of less than an hour immediately prior to the test.