Police respond to tow company’s call of vehicle off roadway during heavy rain storm. Police arrive some time later and interview client at scene where he admits to being driver of vehicle that went off roadway after hitting large puddle. Police cannot find puddle in roadway and ultimately arrest client for DWI after he allegedly fails field sobriety tests. Government cannot establish beyond reasonable doubt that client was driver of vehicle at time of accident as there is no other corroborative evidence linking him to the vehicle. DWI charge dismissed prior to trial.