blue light bandit
n.— «Impersonating police officers has become so common that law enforcement officials refer to them as “blue light bandits.”» —“Attack by fake officer reported” by Fred Kelly Charlotte Observer (N.C.) May 29, 2005. (source: Double-Tongued Dictionary)
Further reading
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In 1971, when a new public library opened in Troy, Michigan, famous authors and artists were invited to write letters to the city’s youngest readers, extolling the many benefits of libraries. One of the loveliest was from E.B. White, author of...