Hell, I have a IR capable monocular. I got it on Amazon for $115.00 . It’s not the best image, but you can definitely see details not visible in the dark.
CC
Thermal imaging is easy-peasy, too. The local cops searched a brushy area for homeless camps. This ought not be that tough. Hell, the Oregon State Police will go to great lengths to find illegal mushroom pickers. I always assumed they were just taking the opportunity to hone their search and rescue skills, but maybe they really wanted the fine money.