In an American movie, a defendant who was charged with murder. During his trial, he suddenly lost his reasons. Later his lawyer came to the prison to meet him, and told him that he was going to be sent to a mental hospital instead of staying in jail.
Roy: When will I see you again?
Lawyer: Well, that's up to the courts now.
Why did lawyer use "courts" instead of "court" ?
Because there's rarely only one court involved in a protracted legal battle, when you consider appeals, and in this case the criminal courts and medical tribunals. It's a common practice just to say "the courts", meaning the legal system.
He didn't lose his reasons; he lost his reason.