10-4 or Code 404? See How Well You Know Police Lingo and Terms
What does "blue flu" mean in the context of police work?

Correct Incorrect "Blue flu" happens when many police officers call in sick at the same time as a way to protest without officially striking. Since police strikes are usually illegal, this is a way to show disagreement over issues like pay or working conditions. The name comes from the blue color of police uniforms.