Police respond to scene of single car crash. Under 21 driver denies drinking and tests .00 on preliminary breath test. Police note an odor of burnt marijuana about the driver and his car. Driver refuses to take any field sobriety tests and refuses requested blood test. State intends to go forward with testimony from arresting officer. Defense contends the arresting Police Officer is not qualified to state any opinion at trial regarding the impairing effects of marijuana. DWI Drugs charge dismissed before trial.