The FBI can lie to you but it’s a crime if you lie to them. Agree - just don’t talk to them.
In the Spring of 1993, I arrived at my office to find two FBI agents with guns waiting to talk to me.
I talked to them.
That began an amazing journey which I will never forget.
I will say that the advice to never talk to them is well-founded, and I wish I had known it before I went to work that day.