Police
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.
警察署に入ると、梅酒のにおいが鼻をついた。
The smell of umeshu hit my nose as I entered the police station.
その警察は、ビエトの警告をあざ笑ったため、後からひどい目にあいました。
That police officer sneered at Viet's warning, so he later found himself in a miserable situation.
警察署での出会いから一時間後、その警察官と泥棒はすっかり意気投合した。
One hour after meeting at the police station, the police officer and the robber had completely hit it off.