One of the nurses is an undercover COP.
Money Heist Season 1, Episode 5
BADGER:
You told me to my face
you weren't a COP, man.
Breaking Bad Season 2, Episode 8
He'’s a retired COP
who plays by his own rules.
The Big Bang Theory Season 12, Episode 4
If you ask a COP if he's a COP,
he's, like, obligated to tell you.
Breaking Bad Season 2, Episode 8
Why would the Chinese make our DVR
record Paul Blart: Mall Cop?
The Big Bang Theory Season 6, Episode 21