Police officer hears loud screeching tires and responds to area of park and ride lot. He sees two individuals outside two different cars urinating at edge of lot. Police only investigate one driver as possible DWI. Driver admits he had a few drinks earlier, as it is his 21st birthday. Driver looks entirely sober on booking video, but blows .10 BrAc. Defense prepared to argue officer violated 20 minute observation period for breath testing sequence. DWI charge dismissed prior to trial.