After three months of questioning, MI5's enormous file included interviews and rambling statements by Evensen which read like a who's who of Trondheim life.
Johnson will be one of the support acts when Ricky Burns defends his WBO super-featherweight title at Braehead Arena against Andreas Evensen on 4 December.
"The Camp 020 interrogators maintain that Evensen ought not to be judged by any ordinary standards as it is obvious that his mental powers are sub-normal, his memory hopeless and his mind an inchoate jumble, " said the final report.