The principle at work is fairly simple, even if the engineering behind it is somewhat mystifying to the lay observer. Drugs like Rohypnol, GHB and Ketamine can go unnoticed if dropped in your drink, but not if a built-in warning system alerts you not to take another sip. The presence of such compounds in a cocktail will make a DrinkSavvy's 16-oz. plastic cup unmistakably change color.
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