Menthol in anything is something that you are warned to avoid if you have an IID installed on your auto (as is pretty much any mouthwash).Listerene strips contain:
Pullulan , Menthol , Potassium Acesulfame , Copper Gluconate , Polysorbate 80 , Chondrus Crispus (Carrageenan) , Glyceryl Oleate , Thymol , Eucalyptol , Methyl Salicylate , Ceratonia Siliqua (Locust Bean) Gum , Propylene Glycol , Xanthan Gum , Aroma (Flavor) , Blue 1 , Green 3.
No alcohols of any sort, so the alcohol could only have come from a different source, possibly a can or a bottle.
Lots of things can cause readings down in the 1% range. Food Lion Diet Ginger Ale does it for me (or used to, anyway).
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