Cop shoots someone dead...while they are lying face-down on the ground. Self defense? Video footage not for the squeamish... "'first, we see the entire, raw footage a 19 year old eyewitness shot on her camcorder, then we hear her explain what she saw and experienced -- she says a female BART police officer tried to forcibly confiscate her camcorder."  She's lucky she did not get arrested for filming a police officer.