美国有个俗话，说grand jury可以决定起诉三明治面包。

“That’s why the old saying goes that a grand jury will “indict a ham sandwich” if a prosecutor tells them to — because the prosecutor calls the shots. ”

https://www.washingtonpost.com/posteverything/wp/2015/12/29/in-tamir-rices-case-the-grand-jury-process-was-turned-upside-down/