audioguy58 My understanding is that SCRAM bracelet is invasive (how else would that work?) so quite obviously it is only available for LEAs (It is medical device that does not exactly have a medical use).
Also the issue with both this and any other kind of something-tracking on body locked devices is power usage. Reading SpO2 by reflecting green and NIR LED off a skin into some kind of photodiode is trivial and processing the resulting data into something meaningful is SMoP. ECG can be done, but there are obvious limitations of the electrode placement. Always active GPS? You just completely blow your power budget. Microfluidics magic? You'd blown both your power and consumables budget.