A notoc is not required for Expedite Baggage, all is required is an unaccompanied baggage manifest which has the signature of the Security Operative which has completed the extensive screening process to allow the luggage to travel.
There are 5 screening methods available for expedite baggage but some airports only have 3 methods.
In smaller airports such as Cardiff they screen the expedite baggage on 2 separate angles.
A copy of the unaccompanied baggage manifest has to remain on station for 7 days along with the Triple A, Bag Tag Manifest, Crew Bag Manifest and Unaccompanied Mail Manifest.
A separate copy must be handed to the flight deck and must be commented on the Loadsheet.
It is a simple rule that no bag can travel without its owner unless it has gone through extensive screening, it was brought in by DFT (UK) after lockerbie bombing. What you have to bear in mind is that a passenger may have not turned up to the gate and had a bag checked in with malicious intent. It is better to prevent than to take the risk.