Without any prejudice to the intentions of AltFlaps in asking his question, I think there might be a good use for such an aparatus; indeed, some airlines (mostly asian) do not tolerate ANY percentage of alcohol detected in their breathalyser, nor would they confirm (or infirm) the breathalyser test by a blood test. I know of some pilot who, though being teetotaller, had nearly lost his job, and got away with a big fine, because alcohol had been detected in his breath. That was due to the fact that, having eaten very garlicky food, he wanted to refresh his mouth and used a lot of mouthwash; unfortunately, little did he know these things containe alcohol!