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.
"We were messing around with cocktails. We had some mezcal laying around, so we designed a mescal cocktail. It's fruity, it's juicy, it's kind of dangerous," said Richard Murphy, manager of Buttermilk Channel at 524 Court St. in Brooklyn. "This whole thing went down and (bar owner) Doug was like, 'Let's call it the Carlos Danger.' And the name has stuck; it's been a hit," he said. "No offense to Anthony Weiner – I'm voting for him."