Breathalyzer tests, although considered fairly accurate, do not always give entirely accurate blood-alcohol content readings. Even when calibrated, the results can vary by 15 percent and some courts have actually dismissed breathalyzer test results as unreliable. There are many ways to refute a case built on the results of a DWI test. Many drivers refuse to take the breath test in the first place -- more than 20 percent of DWI suspects, in fact - but refusing the test has the potential for many consequences, even when it sometimes makes for an easier defense.
A multi-jurisdiction DWI checking station was conducted recently in North Carolina. Multiple agencies participated at the checking station, which ran from the late evening until the early morning. Two drug charges, eight open container violations and 11 DWI charges were the result. The station employed something known as the BAT Mobile -- a breath testing bus.