It may be possible to hook yourself up with [static straps][1] on both wrists (and perhaps ankles) then connect a voltmeter or scope to the ends.  

There are [devices for testing a static wrist strap][2] while it is being worn by a user. The unit passes an extremely low current to the strap and through the user as they touch a conductive plate or button on the device. So there is a way to detect a small currents through the body.  

There are also [wearable voltage detection devices][3] that can detect live 50/60 Hz voltages at moderate distances, it may give you a warning just before an electrical contact to your body. Similar to this you could even construct your own [circuit for detecting 50/60 Hz voltages at a distance][4]. Such a device might give a reading if placed near a [person who is being shocked][5] by a live AC wire.

You might also try a kind of [current transformer][6] placed around ones arm, leg, or other parts of the body. As with a typical current transformer trying to detect very low currents in this manner may require several loops of wire. I think there is actually a [prototype of this idea][7].


  [1]: https://www.corporatearmor.com/product/tripp-lite-esd-anti-static-wrist-strap-band-with-grounding-wire-anti-static-wristband-p999-000/
  [2]: https://assets.testequity.com/te1/Documents/pdf/Desco-TB-3017-Portable-Wrist-Strap-Tester-Datasheet.pdf
  [3]: https://www.etcrmeter.com/etcr-1860c-wrist-type-low-voltage-alarm_p78.html
  [4]: https://www.electrothinks.com/2021/07/Non-contact-ac-line-detector-using-bc547.html
  [5]: https://favpng.com/png_view/electro-man-cliparts-electrical-injury-electricity-shock-clip-art-png/kCdL0V9w
  [6]: https://www.electricaltechnology.org/2018/03/current-transformer-ct-types-applications.html
  [7]: https://pixels.com/featured/man-wrapped-up-in-telephone-wire-csa-images.html