Bail is basic to the system of individual protection set up by the U. S. Constitution and comparable state documents. Without bail, a person could be held indefinitely, until it is convenient to release him. Bail bolsters what the U. S. Supreme Court has called a traditional right to freedom before conviction. It also permits the unhampered preparation of a defense and serves to prevent the infliction of punishment prior to conviction. Unless this right to bail before trial is preserved, the presumption of innocence -- which every defendant retains until proven guilty -- would lose its meaning