Police stop Client for traveling 25 m.p.h. on highway. Defense introduces evidence of mechanical failure in vehicle to explain abnormally low speed. Evidence of .19 BAC breath test excluded by defense due to contamination of breath sample by mouth alcohol and lack of mandatory 15 minute waiting period before re-testing commenced. Defense challenges officer’s observations of red/glassy eyes, slurred speech and poor performance on field sobriety tests. Not guilty verdict following trial.