walking while black - Trayvon Martin

[IMaDick]

And the reports/rumors were that he was shot at close range, SO one would assume there would be blood all over the front of him.

Blow back is a very fine spray or mist, I doubt that the footage was of sufficient quality to make it visable, it is also possible the clothes he was wearing were already gathered as evidence and he had changed clothes by the time he got to the jail, this would be true if he had already been to the hospital.