what is the difference between trial jury and grand jury?
 A trial jury usually has no say in what evidence they get to see. Evidence in trials is carefully chosen by each party's attorney and must adhere to a set of rules designed to ensure that the evidence is reliable.
A grand jury is composed of 23 members. Ordinarily, they listen to evidence presented only by prosecutors and determine whether there is probable cause to believe that a crime has been committed by the individuals 