Except the Brown family lawyers would have absolutely no standing in any criminal trial. You sequester the jury and let the DA present the evidence. The Brown people will bring civil action but even there the grand jury is a safeguard as any witness contradicting grand jury testimony would be liable to charges of criminal perjury/
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That wouldn't matter. My point was that they would foment turmoil in the press, and gin up demonstrations and riots. The trial would be drawn out as the DA makes his case against the officer. Would you really want an indictment and trial that would be a mockery of justice? The right thing was done, having a grand jury see all the evidence without the lawyers spinning everything.