Is the breathalyzer accurate?
The breathalyzer is a machine like any other that is not perfect and is subject to challenge. It’s made by humans, it’s maintained, it’s inspected, and it’s run by humans, it is subject to error. It has had many software updates. The current Intoxilyzer has had many software updates since it first came into existence and simply because someone has blown over the legal limit does not mean that the accuracy of those results is not subject to challenge in court.