ribit,
"...I still want to know who was screaming right before the shot. Whoever it was sounded terrified. I could not even understand what they were saying.
Trayvon's mom identified it as her son screaming.
He told his girlfriend on the cellphone that he was being followed, his girlfriend told him to run, he said he'd walk fast.
Remember who had the gun, Zimmerman & he's 100 pounds heavier than Trayvon & he left his vehicle to pursue Trayvon.
Trayvon was tested for drugs after his death. They didn't test Zimmerman...
I agree with you, this could/should have been prevented.