Can I be charged for this?

My friends and I were at my friends dorm and the residential director came in and informed us that we would be conducting a vacancy inspection for the upcoming student who will be occupying the room. During the inspection he informed us that he observed some sort of residue on the desk which he believed to have been heroin. As soon as he promulgates this two of our friends leave. (The RD makes no attempt to find the other two people who were with us when this all transpired.) The police come and investigate the nature of the residue and verifies it to be tobacco. She then arbitrarily searches the remainder of the common area which is strictly prohibited since none of the residents are present to give consent. They find two cigarillos and some bags in the trash can. We all get arrested and brought to the station. The bags they brought with them tested negative for THC. My question is: >Can I be held accountable for the contents of a trash trash can, in a home, that isn't mine