I used to manage a clubhouse with card readers. Once one would swipe their card, their photo would pop up on my computer in the office, and I had gate attendee to check. They didn't work. People would pass their cards to friends, etc. and most times, out of politeness, people would just hold the gate open for those behind them or when they were exiting. It's a huge expense to install card readers.
The Community Watch checks the pools but are informed not to bother anyone in the pool or who are sleeping. No brainer there if you are an outsider, either swim or sleep when you see them coming.
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