The Core instrument defines "high-risk" drinking as having five or more drinks in one sitting at least once during a two week period. (High-risk drinking and "binge" drinking refer to the same behavior) In the JMU Continuing Student Survey 2009 (see link: http://www.jmu.edu/ie/Surveys/CSS2009.pdf ) students were asked their definition of High risk drinking. Results are below.
If you add the 9-11 drinks and 12 or more drinks- 50% of the JMU students surveyed think that it takes twice (or more) than the 4-5 drink limit to meet the definition of "high-risk" drinking. Part of how the CORE survey developed the definition of 4-5 drinks is that it is the amount of alcohol that must be consumed for an average male to meet the legal definition of intoxicated and would result in Driving Under the Influence charge. JMU students have an extremely distorted definition of "high-risk" drinking that serves to encourage "high-risk" drinking and the negative alcohol culture.