There are dozens of possible defenses, including:
The officer had no right to pull you over in the first place (see above for details).
You were more intoxicated at the time you took the breathalyzer than you were at the time you were pulled over (the “rising BAC defense”).
The officer misused the breathalyzer machine, resulting in a false reading (he administered it two minutes after your last drink, for example).
You have a condition, such as diabetes, that falsely inflated your BAC.