A false confession is an admission of guilt for a crime for which the confessor is not responsible. False confessions can be induced through coercion or by the mental disorder or incompetency of the accused. Research demonstrates that false confessions occur on a regular basis in case law, which is one reason why jurisprudence has established a series of rules—called "confession rules"—to detect, and subsequently reject, false confessions. Plea agreements typically require the defendant to stipulate to a set of facts establishing that he/she is guilty of the offense; in the United States federal system, before entering judgment on a guilty plea, the court must determine that there is a factual basis for the plea.