You don't know that.Jessica,
The civilian dispatchers should have passed on it was possibly a fake, but the police have to assume it's real. No where is it written in the Criminal Code that the police have to be shot first.
The police need better training as they shouldn't be driving right up to the suspect, but the outcome would not have been different. Take a look at the fake gun recovered. If that gun was pulled on officers from point blank, they would not be able to tell whether it was real or not. The boy was told three times to show his hands. Instead he reached for his waistband. His death was his own undoing.
http://wtvr.com/2014/11/26/police-werent-told-12-year-old-they-shot-might-be-carrying-fake-gun/
If the officer had kept a safe distance, he wouldn't have been as vulnerable, the outcome could have been different.
Is there conclusive evidence that the boy was warned three time?
Apparantly, the officer opened fire two seconds after he got there, is that enough time for three warnings?
Don't police carry body cams and /or squad car cams and recorders now, any footage or tape would help to clarify.