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Last week, Nassau County, on New York’s Long Island, became the first county in the US to ban the public wearing of masks—with very vague health exemptions—since the start of the Covid-19 pandemic. The Nassau ban follows a similarly controversial statewide mask ban in North Carolina that took effect in June.

Several concerns have been raised about Nassau’s mask ban, including that police officers—not experts in public health or medicine—are tasked with determining whether an individual is wearing a mask for valid health reasons. But another is that the pandemic is not over, and wearing medical masks while grocery shopping or even at a protest is meant to limit exposure to the disease—and some residents expect a ban to lead to harassment by local anti-maskers.

The county’s move has prompted the first........

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