And just "who" are these checkers. Male/female/young/old/residents?
I have never been asked at our pool for ID, but the person asking better have some concrete ID themselves. I have come to our pool to relax, not to be hassled.
Of course, if the Sheriff asks, I would be happy to show my ID.

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Patriot Guard Riders--"Standing for Those Who Have Stood for US"!
Laughter is the best medicine, unless you're being treated for Shingles