A new wearable sensor, disguised as a temporary tattoo, detects trace amounts of gamma-hydroxybutyrate (GHB) in beverages within one second, using a colorimetric chemical receptor embedded in an agarose gel. Detailed in a July 23 ACS Sensors study, the sticker uses the silicone-based polymer polydimethylsiloxane film and poly(vinyl alcohol) for durability and adhesion, offering a…