Driver stopped following a citizen cell phone report of erratic operation. When driver is stopped police note several canisters of nitrous oxide which she states are left over from baking party with friends. Police note agitated, unusual behavior, but note of the classic signs of alcohol impairment. Driver’s medical record is replete with disabling conditions and prescribed medication use. Defense contends post arrest blood test reveals only therapeutic levels of prescribed medications. State Toxicologist intends to counter that combined effects of prescribed medications with use of nitrous oxide caused impaired/intoxicated driving. DWI Drugs charge dismissed before trial.