I work with infrared cameras, I'll check this out tomorrow! Useful for things like seeing if someone's just left the office for lunch because their chair's warm

I work with infrared cameras, I'll check this out tomorrow! Useful for things like seeing if someone's just left the office for lunch because their chair's warm. Reminds me of the scene in one of Dan Brown's books where they catch the protagonist by noticing a conveyor belt has warmed up (which he lay on to escape). The first time I read that I thought it was nonsense, but having used decent cameras I'm inclined to believe it now.