I can see the potential for invisible rfid tagging and similar biomonitoring possibilities. But biomonitoring might be easier using cheap, remotable terahertz r

I can see the potential for invisible rfid tagging and similar biomonitoring possibilities. But biomonitoring might be easier using cheap, remotable terahertz radars such are currently used to detect human presence/heart rate/respiratory rate/blood flow for about 2 dollars. With a 1.5m range, those might be ideal for training or augmenting facial recognition models for sentiment analysis.