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Marijuana. Questions are raised of how to test if someone was driving stoned. If it was an alcohol case we do breath and draw blood. If its marijuana, i cant do that. Reporter this marijuana breathalyzer could change that. The Science Behind it is so challenging. Reporter breathalyzers measure alcohol in parts per thousand. Marijuana is more difficult to detect. California based how do you know labs say its find way trilen. We settled on a chemical solution. Reporter driving under the influence ...