Airport security has always been a painful but necassary experience. I am required to pass through security every day and even with my pass, CRB checks and tools pass i am still required to put my leatherman through the scanner. However if i try to take a yoghurt through then i am in trouble!
The problem is rules are there for everyone and it does not matter if you are a passenger or staff. Now if a scanner like this speeds up the entire process then great so long as the operative is not sitting right next to the machine as you can imaging it now when some really fit hostie walks through!
I am sure the scanner will not be fitted with a usb port to download pics and the operative will have had to pass through security checks themselves.
At the end of the day, anything that makes flying safer is a bonus.