Thin blue line - Canada version License Plate
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"Thin blue line" is a term that typically refers to the concept of the police as the line which keeps society from descending into violent chaos. The "blue" in "thin blue line" refers to the blue color of the uniforms of many police departments. Image attribution: By ИдеологиÑÑ‚ - Derived from: Flag of Canada, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=90881277.