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If you persist, you will end up on the greylist.

The restaurant maintains a notional greylist and a blacklist of unpleasant diners.

The software can set up a “whitelist, greylist, and blacklist” of license plates: the whitelist permitted at any time, the greylist only at certain times, and the appearance of a license plate that’s on the blacklist – a disgruntled ex-employee, or someone against whom a current employee has a restraining order against, for example – immediately triggers an alarm.