Forty Ss, 20 males and 20 females, observed a videotape that showed four males interacting in a social setting under four different drug conditions; coltsfoot, placebo, marijuana low dose, and marijuana high dose. The observers attempted to discriminate the level of intoxication of the four males in each condition. The observers accurately detected the level of intoxication in the high dose condition. While marijuana experienced users were more successful in detecting levels of intoxication, the sex of the observer was not significant. Behaviors used to discriminate intoxication and the implications of these results to defining intoxication are discussed.