Hi - my name is XXXXX XXXXX I'm a Criminal
Law litigation attorney. Thanks for your question.
It is certainly possible to challenge the test results. Generally, breathalyser machines have a slight margin of error (plus or minus 5 or .005, and if the BAC was right at .08 or up to .085, it may be that the court
would dismiss the charges based on the recognized margin of error the machine has.
Also, there are literally hundreds of defenses to a breath test - - whether or not the officer observed you for at least 20 minutes immediately before the test, whether you had taken anything by mouth, whether the mouthpiece was changed between blows made, whether the machine was properly calibrated, etc.
It would be well worth it to have an attorney review your ticket, arrest report, etc. to find grounds to challenge the citation. However, your strongest claim would likely be the margin of error for the breathalyser.