You say the basic calibration skills are too hard to learn?
You say you can't be bothered to do all that noticing?
Now, the miracles of modern technology can do away with all that busy work and do (at least a little bit) of your calibration work for you!
Project Hostile Intent plans 'non-invasive' DHS brainscan | The Register
Sure, you'll have to run people through a gauntlet of 'noninvasive' scanners and, sure, they'll really only tell you if people are nervous and therefore possibly aggressive, but it leaves you will save yourself the hard work of actually having to connect with people in your environment or mess with all that pesky 'uptime' and 'fully engaged in enjoying the moment' business!
Sure, it's several million quid worth of gear to do an extremely limited and rather piss-poor job at what well-trained NLPers do easily, effortlessly and automatically but hey, aren't you worth it?
Be Well,
Michael Perez