I was recently charged with possession with the intent to sell narcotics. The thing is that they belonged to a?

Room mate that happened to live in the living room on a sofa couch. He stored the drugs in my room ( I know very stupid of me im beating myself up daily) in which lies my delema. If i have previous roommates of his as well as my other current roommate, and friends that are willing to testify against him/ for me will that present any type defense for me. These people are all college graduates and well respected people.