Police stop vehicle for speeding at 12:30 a.m. Client admits that she consumed “two margaritas” Officer notes unsteadiness upon exit from vehicle, red, glassy eyes and slurred speech. During standard field sobriety tests driver informs officer that she suffers from vertigo and cannot complete balance portion of tests. State offers evidence of preliminary breath test result at scene of .096 BAC. State admits client’s refusal of subsequent intoxilyzer breath test at station. Defense challenges accuracy and reliability of single preliminary breath test and field sobriety tests in light of diagnosed vertigo. Not guilty verdict following trial.