I want to come back to one of the questions asked.
When you receive a file involving a national security element, it is provided that you should transfer that file and end the investigation. You have proposed a procedure whereby the new agency would refer the file to you if it determined that no investigation was needed.
Wouldn't it be simpler for you if the file was suspended until a confirmation was given for you to continue the procedure?
That puts an end to the issue of national security, and you know that you can close the file. If the file remained open, you could continue the procedure.