WHBM
I understand and agree with what you are saying regarding the squeezing of resources, it might just be me but on the last 3 occasions that I have been through INV security (all within the last 6 weeks) each time someone in front of me has been pulled and had their bag manually searched with either bottles of water or a nail file etc being fished out.
It might just be me being unlucky at INV and getting stuck behind someone who is a bit dim or chancing their arm trying to take liquids through, or the travelling public still don't understand the now not so 'new' rules.
I also agree with what others said earlier, I have only ever saw one screener in use at INV and with several departues clustered together both machines should be in use