We are getting to the point where we can infer pulse rate from sufficiently good video [1]. Same for breathing. Eye tracking is well studied. So just combine all that into a single device, an AttentionScanner™ for your meeting room. This device could mark infractions to help in the yearly performance review, or help employees stay alert directly by delivering small electroshocks via their smart bracelet [2]. Contact our sales department now (/s)

1: https://spectrum.ieee.org/smartphone-camera-senses-patients-...

2: https://pavlok.com/