As a matter of fact, you have every legal right to sue anybody you want as long as there is a valid cause for such. However, all legal right to enforce an action are not perpetual right, but a right is generally limited by law. The CBN is an agency of the Federal Government that enjoys the protection contained in the Public Officers Protection Act. When you do not bring your case within the time frame, then it’s no longer necessary whether you have a good case or not. Your right to enforce an action is barred. Section 2(a) Public Officers’ Protection Act 2004; U.M.B Ltd. V. C.B.N (2017) All FWLR (pt. 880) pg. 846