What are the requirements to be a witness, and how are those requirement applied during the examination of witnesses.

What are the requirements to be a witness, and how are those requirement applied during the examination of witnesses.

Briefly discuss the key rulings of the following cases and the significance of those cases in defining the function of the jury. Apprendi v. New Jersey, Ring v. Arizona, Blakely v. Washington. 

Imagine you are an expert in the field of criminal justice and you have been contacted by a national news syndicate to help them develop an informational segment about the structure of the criminal justice system. How would you describe a general overview of the criminal justice system from entry into the system to sentencing and corrections? How would you explain how this overview of the criminal justice system is relevant to criminal evidence?