'Aberrational': Former judge stunned at DOJ’s 'unprecedented' string of grand jury defeats

Former federal judge John E. Jones III says he can't recall a single instance of a grand jury refusing to return a true bill during his 20-year tenure, with the current trend of 3 grand juries refusing to indict being a stark change in legal norms, as reported by Salon.
Grand juries in Washington D.C. have refused to indict in 3 high-profile cases, including a man who threw a Subway sandwich at law enforcement and 6 Democratic lawmakers who reminded military members to disobey illegal orders, with Jones stating "it's completely aberrational" for grand juries to push back against the government like this.
According to Jones, grand juries typically approve indictments due to the low "probable cause" threshold and one-sided arguments, but these recent cases show grand juries are now "clearly saying" they don't think the cases are worthy of federal indictment, even when accepting the presented facts as true.