500  words

 Compare and contrast voluntary and involuntary confessions.  How did the court apply these concepts to the Miranda decision?  Provide and example of when a person is and is not in custody.  Is there a difference between an interview and an interrogation?  If a person waives his or her Miranda rights, how long is the waiver valid?  Can a person change his or her mind?  Can the police keep trying to get a suspect to talk until he or she agrees to do so without a lawyer?  Should there be any exceptions to the rule that a person is to be informed of their rights?  Discuss.