expression, godan verb (-ru)
be arrested; have one's hands tied behind one's back
Idiomatic expression literally meaning 'one's hands go behind one's back', used figuratively for being arrested or restrained by police.
彼はついに手が後ろに回った。
He finally got arrested.
悪いことをすると、すぐに手が後ろに
If you do bad things, you'll soon get your hands tied behind your back (be arrested).