I used to work for MAplc where I was OPS3 (Airfield Duty Manager).
The run-ins I had with colleagues in Security were many and various, though I did occasionally win.
Screening by use of scanners, physical examination, confiscation of hazardous objects and profiling all aim to reduce the terrorist threat of hijacking or destroying the aircraft in which terrorists are being carried.
Now I know this is a bit radical, but has any bizjet owner hijacked his or her own a/c using nail clippers or carried a bomb on board intending to blow up their pride and joy?