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 charge bargaining, defendants plead guilty to a less serious crime than the original charge. In count bargaining, they plead guilty to a subset of multiple original charges. In sentence bargaining, they plead guilty agreeing in advance what sentence will be given; however, this sentence can still be denied by the judge. In fact bargaining, defendants plead guilty but the prosecutor agrees to stipulate (i.e., to affirm or concede) certain facts that will affect how the defendant is punished under the sentencing guidelines.