I could be wrong, but in a case were someone makes an admission to a crime no trail is required

I would be very interested in seeing where that has happened. Surely a trial is always required prior to sentencing. Well, unless you happen to be the wrong religion and end up in Guatanamo Bay but that is a different kettle of fish altogether. The trial may only consist of one question, 'How do you plead?' and one answer 'guilty' but that is still a trial all the same.

Cheers

Dave