Level
1: Automated evaluation of the X-ray image by the X-ray
Machine.
Level
2: Operator analysis of the Level 1 image at a workstation(s),
carried out whilst the bag continues in transit.
Level
3: A more in-depth analysis of the original Level 1
image at a separate workstation(s) or subjecting the bag to a
separate X-ray process using a different X-ray technology, for
example Computer Tomography (CT Scanner).
Level
4: Re-uniting
the passenger and bag and carrying out a manual search.
Level
5:
In the event
that the passenger cannot be found, then the bag is considered
a bomb threat and dealt with accordingly.