noun, の adjective
They warn you and they guess when you've done something wrong (with evidence, of course!). They are the police.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
The smell of umeshu hit my nose as I entered the police station.
That police officer sneered at Viet's warning, so he later found himself in a miserable situation.
One hour after meeting at the police station, the police officer and the robber had completely hit it off.