To be clear, the research has been going on for a while. But extracting an accurate enough signal from noise through the skin is an incredibly complex signal a

To be clear, the research has been going on for a while. But extracting an accurate enough signal from noise through the skin is an incredibly complex signal analysis problem. And there are multiple approaches. Nothing has FDA approval yet because it's a major question whether any technology developed thus far is accurate enough. I understand there's at least one clinical trial going on right now. Fingers crossed...