2)

You've way understaffed a Pre lane. You need:

1 Pre lane monitor (at start of Pre lane)
2 TDC
3 "moat dragon"
4 belt monitor
5 xray screener
6 WTMD monitor
7 male 'groper'
8 female 'groper'
9 bag searcher
10 tub stacker
11 swabber
12 spotnik/BDO
13 LTSO (at least one)
14 STSO (at least one)

That is, of course, minimum staffing. No TSOs are assigned two functions at the same time, so the individual who stands and blocks an already roped-off WTMD can't help stack tubs. I've lost count of how many non-working LTSOs and STSOs actually are assigned to each checkpoint, since they are usually off to one side gawking at hot pax, playing with their cellphones and engaging in personal conversations while ignoring what's going on around them.

Outside the US, I generally see less than half that number, all of whom clearly have assigned duties and who are working most of the time. I never see groups of non-working security staff standing around chatting and playing with their cell phones outside the US.