About one in three public four-year colleges and universities ban alcohol on campus, according to a 2004 Harvard School of Public Health study. However, about 81 percent of colleges and universities offer dry residence halls or floors in campus housing.
This 2004 study, the most recent of its kind, in part measured the efficacy of a campus-wide alcohol ban. The study found no real difference between the number of binge drinkers at dry campuses with those at campuses without an alcohol ban. Some colleges that don't implement an alcohol ban must comply with state alcohol-related laws. In 2014, colleges and universities in Maryland banned grain alcohol and other alcohol that is 190 proof or higher after the state banned the sale of such alcohol.