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It was invented by some teenagers for a high school business plan competition in Miami.
GHB and Ketamine are common date rape drugs (as well as being used voluntarily for recreation). They don’t have a smell or taste, so victims can’t know when they’ve been slipped into their drinks.
The straw invented has a strip that turns blue when it comes in contact with GHB and Ketamine. The three girls behind the idea are seeking a patent for their design.