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
A listener named Tami contacted the show by WhatsApp to say that whenever someone would be talking about a subject that nobody else knew anything about, her father-in-law would respond with I had one of those, but the wheels came off. This is part...
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...