Detention
Confinement
Arrest and put the criminal in detention and confinement. Get in there, criminal!
こうち
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
その女性は豆芝を膝に載せたまま酔っぱらっていたので、見かねた警察がその犬を保護拘置し、後から返してあげたそうです。
I heard that the woman was drunk with a miniature Shiba Inu on her lap, so the police, who could not bear to see the situation, took the dog into protective custody and returned it later.