Media Detective is a media literacy education program for 3rd- to 5th-grade students. The goal of the program is to prevent or delay the onset of underage alcohol and tobacco use by enhancing the critical thinking skills of students so they become adept in deconstructing media messages, particularly those related to alcohol and tobacco products, and by encouraging healthy beliefs and attitudes about abstaining from alcohol and tobacco use. The program consists of 10 45-minute lessons based on established models of decisionmaking and research on the message interpretation process. Students are taught to deconstruct product advertisements by looking for five “clues”: (1) the product, (2) the target audience, (3) the ad hook, (4) the hidden message, and (5) missing information about the health-related consequences of using the product.