I would be careful. The FBI knows about Tor. To my knowledge while they can look up that you've been on Tor they can't look at what you were looking at. I think that in the off chance they can trace things back to you they can only gather METADATA which is the big picture of your data but they would basically have to give that to an information analyst and even then it would take them too long to break down that data and store in in their own database that it would be ineffective evidence in a hearing.