Also, I feel like there is something important you don't understand about the US system. A grand jury isn't a jury trial. A grand jury just allows a jury trial to happen (for a defendant to be charged at all). The defense isn't part of a grand jury. That's why the quote is what it is. It isn't talking about jury trials, just that a prosecutor can charge someone with a crime (the outcome them winning at a grand jury) pretty easily. Hope this helps.