My worst experience as SLF was from Boston to LHR. First time through security control involved shoes off, trowsers down as suit trousers have waist tightening metal tags. I wanted to go for a cigarette which involved going back through control and back into the airport again. This time I used a different security control and none of the above happened...where is the consistency! I went for a few more cigarettes as I waited 2 hrs for the plane and not once was I subsequently checked. I am quite happy for them to have security as it has been a way of life for a very long time at LHR but it is only as strong as the weakest link. Some of the security I have experienced on the 40 plus flights I have taken in the last 6 months has been woefully inadequate.
As for checking flight crew...beyond any comprehension.