a bitter 'custody battle' [=a legal fight between divorced parents about who will take care of a child]
He was taken 'into' (police) 'custody' last night and will be charged with murder today.
The witness is 'in protective custody'. [=is being kept in a safe place by the police]
(..) What did you tell them? Nothing. I had nothing to tell them. I only had grams, you know the law. They couldn't do anything. They kept me in custody and eventually had to let me go. Do you want to have a sandwich? - I'm not getting in this car. - Get in. - Let me go! (..)2011 The Intouchables