Two experiments were conducted to determine whether a warning poster w
ould effectively convey alcohol-related information to college student
s. In experiment 1, a warning poster containing alcohol facts was post
ed at several social fraternities. Students' knowledge of alcohol haza
rds increased after exposure to the warning, though much of the inform
ation was already known. In experiment 2, the poster was refined and i
ncluded less-well-known facts. Students knowledge increased after expo
sure to the poster. These results show that posted warnings can effect
ively communicate important information to one ''at-risk'' group, coll
ege students. Suggestions for improvement and potential utility for ot
her groups at risk are discussed