One of the strategies that helped bring about an 85% reduction in crime in New York City between 1994 and 2013 was the careful and appropriate use of “stop and frisk.” This practice dramatically reduced the number of guns, knives and other dangerous weapons, as well as illicit drugs, in the city.

But according to candidate Hillary Clinton and moderator Lester Holt during Monday night’s presidential debate, stop and frisk is “unconstitutional.” They are wrong. In Mrs. Clinton’s case, it’s the usual misrepresenting she does...