Begin by matching the prints and shoe prints to your suspects. This will most likely elimenate two of them(pay attention to detail) Then get statements from all of them as to where,when,what or why they should be discounted,and validate their stories(confirm with a witness that says the same thing "Yes....Suzy was with me at the movies")
This will also eliminate suspects.
After this process of elimination,you need to further eliminate by matching the evidence you have to a particular person. If you cannot definatley make a conclusive match,you have no case.
Once you have a firm match of evidence to person,you need to see if the person will confess,by offering a deal (less time in jail). If they wont confess to the allegations,you go to trial,and make pointed remarks and Q's regarding why there is no other person that could have commited this "crime"
Think of the process in simple terms:
Billy had cherry gum in his locker,it was broken into,and the gum was missing(Q: was the door broken? Could Bobby be lieing?) Mike has Cherry Gum. He was not in class at **** time...he had a hall pass. He knows how to open lockers,he opens them for friends all the time.
He asked for a peice of gum earlier(so now you know he didnt have any before),but now he has the EXACT flavor and brand that was stolen. this is all "circumstantial" evidence (not good enough for a hard conviction).
A 7th grader told the principal he SAW someone opening the locker.....now enters the "line-up".
The 7th grader ID's Mike. Now get a story from Mike. Who,what,when,where,why? See if he will confess if you promise not to tell his parents.
He wont confess.....you go to the principle(AKA The Judge) and ask for the most severe punishment possible,based on the evidence you have presented.
Did all that help? I hope so....my fingers are sore!!!