Driver stopped by police as he exits highway through long off ramp. Driver admits that he drank at a club earlier but claims he is not impaired. Field sobriety tests and preliminary/portable (PBT) breath test result in arrest despite driver telling police he had a prior leg injury that would affect his performance on the tests. PBT evidence not admitted in Massachusetts because of lack of scientific reliability. Defense admits driver’s certified medical records to document short leg syndrome and limp. Passenger testifies as to the driver’s sobriety and how the police conducted their “investigation” roadside. Not guilty verdict following trial.