Reading about old crime cases from the 90s and even into the early 00s and police *really* believed that polygraph tests worked. Even in cases in tiny little towns they'd whip that thing out and make all kinds of wild inferences bases on what amounts to noise.
Now and then you hear about one of them being used to this day.
Absolutely wild and terrifying.
There are still "experts" running around who claim they can teach cops about "body language" that will tell them who is lying.