80’s – 90’s movie wher a guy has a helmet which detects non humans

I remember a movie where in a given moment a guy finds/discover something like a helmet which could detect “not human” people with an on screen message telling “non human” when someone was ahead of him and – i don’t remember if it’s about demons or zombies that looked like normal people unless he used that helmet.

I don’t remember  more about the movie except that specific scena and that it was in the 80’s or early 90;s.

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