I'm guessing this is a cop fandom, but whoa, I know nothing about it.

It's not just one cop fandom. There is:

Law & Order
Law & Order: Criminal Intent
Law & Order: Special Victims Unit
Law & Order: Trial By Jury
Law & Order: Crime and Punishment
Law & Order: the computer games
Law & Order: The Musical
Law & Order: Pastry Division
Law & Order: Cat Up A Tree
Law & Order: Pastry Division
Law & Order: Life on Mars
Law & Order: The Search for Spock

I only lied about half of these.