Only via ‘Distance viewing’ techniques.
WD40 is good for detecting locally cloaked humans.
It’s actually got about 2000 more uses, as well.
OK...who
So is puffing a handful of itching powder.
I could never understand why they didn’t try that in “Hollow Man.”
Or pepper. Elizabeth Shue could say, “I sure hope there are no invisible people around me.” Then puff a handful of pepper into the air. If the air sneezed, after she said, “Bless you” she could run.
They never think of the obvious solutions when they make those movies.