There was no taping that the Prosecution could come up with, but there’s no invasion of privacy when it’s your own room. Dorm rooms really aren’t the same as your bedroom in your home.
If the defense lawyer tried to make the argument you suggest in court, the judge would say 1. are you serious, 2. what is the status of your law license, and 3. shut up before I sanction you. And not necessarily in that order.