Client stopped by police for alleged erratic operation initially reported by citizen cell-phone witness. Police video records roadside encounter including field sobriety tests. Defense excludes evidence of .291 BAC on preliminary breath test due to police failure to properly advise client of statutory warnings regarding voluntary preliminary breath test at roadside. Defense excludes evidence of .22 BAC intoxilyzer test result due to police failure to maintain strict twenty minute observation period of defendant before test. Evidence of client’s prior Massachusetts court appearance on OUI charge insufficient to prove second or subsequent offense. Not guilty verdict on Aggravated DWI complaint and Subsequent DWI complaint following trial.