Plea bargaining in the United States
The constitutionality of plea bargaining was established by "Brady v. United States" in 1970, although the Supreme Court warned that plea incentives which were sufficiently large or coercive as to over-rule defendants' abilities to act freely, or used in a manner giving rise to a significant number of innocent people pleading guilty, might be prohibited or lead to concerns over constitutionality. "Santobello v. New York" added that when plea bargains are broken, legal remedies exist.
Plea bargain
In some common law jurisdictions, such as Singapore and the Australian state of Victoria, plea bargaining is practiced only to the extent that the prosecution and the defense can agree that the defendant will plead guilty to some charges and/or to reduced charges in exchange for the prosecutor withdrawing the remaining and/or more serious charges. In New South Wales, a 10-25% discount on the sentence is customarily given in exchange for an early guilty plea, but this concession is expected to be granted by the judge as a way of recognizing the utilitarian value of an early guilty plea to the justice system - it is never negotiated with a prosecutor. The courts in these jurisdictions have made it plain that they will always decide what the appropriate penalty is to be. No bargaining takes place between the prosecution and the defence over criminal penalties.