"and most of them would be completely invisible and 100% effective" ... You realise that would mean they could be doing this right now? :P Personally, I sus

"and most of them would be completely invisible and 100% effective" ... You realise that would mean they could be doing this right now? :P Personally, I suspect they're not as I assume at least one person would have enough backbone to challenge them over it, so I don't think it's something they could legitimately get away with.