Elderly client stopped by police for expired registration plates returning from late dinner with friends. Accused drunk driver admits to drinking two beers and completes field sobriety tests to the best of his ability. Preliminary Breath Test (PBT)at roadside reports .11 BrAC. Client refuses subsequent breath test at station. Defense contends PBT is inaccurate given inherent limiations in fuel cell technology and client is not an appropriate candidate for field sobreity tests given his advanced age. DWI charge dismissed prior to trial.