Final answer:
The correct cases regarding promises made in plea agreements are Santobello v. New York, which addressed the withdrawal of a guilty plea, and Ricketts v. Adamson, which focused on the breach of a plea agreement.
Step-by-step explanation:
The cases regarding promises made in plea agreements are Santobello v. New York, which dealt with the withdrawal of a guilty plea, and Ricketts v. Adamson, which was concerned with a breach of a plea agreement. In Santobello v. New York, the defendant was promised a certain plea deal that the prosecutor later reneged on.
The Supreme Court held that when a plea bargain is agreed upon, it must be honored by the prosecution. Conversely, in Ricketts v. Adamson, after the defendant breached the plea agreement by not testifying at a co-defendant's trial as he had agreed to do, the Supreme Court allowed the prosecution to reinstate the original charges because the defendant did not fulfill his end of the agreement.