As ever, Johnboy is on the money; GHB is just NOT anywhere near the number 1 date rape drug- it IS the most worried about. Work out of WA shows NO GHB in ANY of the alleged drink spiking cases- it's all alcohol. We have the same results out SA. There's no doubt that drink-spiking happens; it's just almost always with ethanol. The best use for those coasters (apart from raising profile of safe bar behaviour, and the fact that GHB isn't nearly as safe as the world thinks it is) is to put them over your glasses to stop someone slipping you another shot of vodka