Besides the nefarious uses, I can think of a number of good uses. One would be to detect ticks crawling up your body. My body is pretty good at detecting them

Besides the nefarious uses, I can think of a number of good uses. One would be to detect ticks crawling up your body. My body is pretty good at detecting them--the hairs on my legs, for example, cause a tickle when a tick crawls by them. And if the tick takes a bite, I start to itch in many places (not just at the site of the bite). But not everyone is that sensitive to ticks crawling or biting, and given how many diseases they carry (not to mention AlphaGal allergy), this could be a good early warning system to have when hiking.