You are not obligated to cover anything you don't want to. in the us, a t outside of the agency would need a release of information to access anything from your time with previous t.
I am seeing a t at an agency where I saw someone else a few months ago. It's actuallyquite bothersome that she is asking me to go over stuff that she should know from access to my file...
also, most agencies will not keep files for longer than 7 years...