From a former student at OU (back over 20 years ago):
When I started as a freshman, those under 21 could possess and consume 3.2 pisswater in their dorm rooms and common areas of the dorm floor; those over 21 could possess and consume 3.2, "strong beer" (over 3.2%) and hard liquor in their dorm rooms and common areas.
When Oklahoma state law changed three weeks after the fall 1983 semester started, the rules were changed prohibiting consumption of any alcoholic beverage in the common areas. Those over 21 could keep alcohol in their rooms, though the rest of us underclassmen could do so as well - it was enforced by a "wink-wink-nudge-nudge" system. The RA's were too busy issuing noise and visitation citations than confiscating booze, unless it was blatantly in the open.
I hate to admit it, but OU's Greek community in those days was awash in alcohol; closed and open parties were graded by the number of kegs bought by the chapter for the function. The local beer distributors sometimes rolled out a keg truck for really large parties like Sigma Chi Derby Days; even the beer cups had Greek letters (except for FIJI) printed on them. My house, being one of the smallest on campus with its own housing, regularly bought a keg every weekend, two if it was football season. Our open party, the "Bayou Bounce" was a 6-8 kegger; smaller mixers, such as functions with the AGDs or the KDs (the rest of 'em didn't wanna socialize with the "motorcycle gang" and "apartment dwellers"
) were one or two-keg affairs.
When my chapter rechartered in 1997, the restrictions on alcohol purchase and consumption were drastically changed. Having little knowledge of the new rules, I got my ass chewed out by a national officer for bringing in a case of the cheapest, nastiest champagne on the face of the earth - a tradition from the olden days. No big deal, though... it stayed hidden in the house manager's apartment until they left before the corks flew.
Being much older - and wiser - about alcohol consumption, I watched my newly-initiated brothers get thoroughly shit-faced while carefully nursing a beer.
Eventually, it was going to come to this new rule making the Greeks and the dorms totally dry; but all that's going to do now is drive drinking underground. Or force some chapters to go off campus to get sloshed.