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Clark: I'm not gonna let who ever did this hide behind their badge.
Chloe: If we're gonna sneak you across this thin blue line, Go undercover?

you're gonna need something a lot
more substantial than just a press pass.
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Hi,

'The thin blue line' is a standard expression that refers, a touch poetically, to the police.

ie They wear blue uniforms. They are a thin line protecting us from criminals.

Clive
Comments  
Thanks, Clive!