npub1yykpeg99uw8gq0tdr0t8d7e7g5hnj982sdfhlfqkvygd2zcyzsxsqqz9px (npub1yyk…z9px) they had a heart attack gun decades ago. DEW's I think is where we're at today. Impossible to detect, without a detection device looking for the right frequency range.
https://allthatsinteresting.com/heart-attack-gun