The SafeGirl 'Not In My Drink' rape drug testing coaster is designed to detect Gamma Hydroxybutyrate (GHB) and Ketamine in realistic concentrations, 3.0g/250ml and 1.0g/250ml respectively.
Simply place a drop of your beverage onto both spots of one test. Smear each gently and wait until dry. If either spot turns to a darker blue colour, a positive test has occurred. Each coaster contains two tests.