My question involves criminal law for the state of: Tennessee

So i just moved to chattanooga to begin schooling, not but a few weeks ago. Before we could move into the on campus dorms we had to sign a contract stating that we would not possess any type of alcoholic beverage. So the other night my roommates, whom before i even moved into the dorms had never met before in my life, decided to have a little get together with some of there friends in our apartment. Needless to say that one of them did acquire a fifth of whiskey and some other sort of mixed drink. As the night slowly progressed they began to get much louder. Little did they know that a security gaurd on campus had been outside listening for any metionings of alcohol or any other illegal substanance. So when one of my roommates finally did mention to one of his friends about taking a shot if whiskey the officer knocked.... My roomies frantically tried to hide the alcohol, after they had done as best they could they came and asked if i would answer the door being as i was the only one that had not been drinking. The guard asked me if we had any alcohol in the room i had instinctively said "no" and so he asked if i minded if he took a look, knowing that either way he was going to search our room. So i told him he could, so he looked in the freezer and low and be hold a fifth of whiskey was in there. He radioed it in and had an officer and an RA come in our room, they made us poor out the alcohol, of course.

----Heres the part that i just really did not understand-----
The officer asked for our school ids as well as our state ids, he wrote down a few things (i.e: address, social, name), but he did not issue any of us any sort of ticket or citation. I am currently on unsupervised probation for a theft under $500, i have already completed my 40hrs of community service and was just waiting for my year to be up so that i could have it expunged, my one question is this; Is this going to stop me from being able to get it expunged? I consider myself a rather reputable student on the campus, im a definate A, B student, and try to stay away as much as possible from any type of drugs or alcohol, especially after my first arrest. Any type of information would be much appreciated, even if you dont know what your talking about, any type of consoltation would be nice. Thanks!