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 colloquy
A plea colloquy, in United States criminal procedure, is a conversation between a judge and a criminal defendant who has been sworn under oath, which must occur when the defendant enters a guilty plea in court in order for the plea to be valid. The United States Supreme Court has crafted a doctrine which requires the court to engage in a specific line of inquiry. Because a guilty plea must be made intelligently, knowingly, and voluntarily, the court must advise the defendant of the following things:
The court must ask the defendant if he understands each of these points, and must receive a voluntary affirmative response. Many courts use a script of the questions which the judge will ask the defendant and the defense attorney in a specific order. Failure by the court to advise the defendant of any of the above points will supply the grounds for a collateral attack on the plea; if such an attack is successful, the guilty plea will be withdrawn, and the defendant will be given the opportunity to enter a new plea. The court can accept and bind the defendant to a guilty plea, even if the defendant insists that he is innocent, and merely taking the plea to avoid conviction by a jury.