>>106215604 (OP)you keep your cellphone on you
we know a whole lot about radiowaves and em waves
studies on eeg are also robust.
i wouldnt doubt that they can take eeg.
we also have companies solyley devouted to analytics.
also consider bofeedback mechanisms.
heart rate, eye movement perspiration, voice inflection. theres alot of things that I think these data compaies capture that arent explicitly stated.
theres alot of "nonverbal" communication data that has been captued for analytics that are pretty effective at predicting behavior.