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Singles bars have never been risk free, but so-called date-rape drugs give you one more reason to be cautious. After a friend was attacked by a man who may have spiked her drink, Francisco Guerra developed a cardboard drink coaster that can identify two of the most popular date-rape drugs: gamma hydroxybutyrate (GHB) and ketamine. Just place a drop of liquid on the coaster, and rub it in with your finger. If the spot turns blue, toss that cocktail. Fifteen million of these coasters have already been distributed; look for them at 7-Elevens around Christmastime.

Availability: Now, 40¢ a coaster
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