A lot of schools have banned hard liquor to some extent – Stanford, ND, WUSTL, Williams, Dartmouth, UVA, etc. Which pretty much implies that beer and wine are de facto tolerated/legalized. That policy makes intuitive sense to me – liquor is quicker after all. IIRC, the Cornell kid at UVA was drinking out of a flask.
But I have not seen any studies on what effect those liquor bans have had in practice.