2. Grand juries, at least at the state level, often do not indict police officers. As Ben Casselman of 538, who made the observation about the rarity of grand juries not indicting, noted, "A recent Houston Chronicle investigation found that 'police have been nearly immune from criminal charges in shootings' in Houston and other large cities in recent years. ... Separate research by Bowling Green State University criminologist Philip Stinson has found that officers are rarely charged in on-duty killings, although it didn’t look at grand jury indictments specifically."
Of course, what would be best to know is the frequency of grand jury indictments at the state or local level. But the governing law, established by the Supreme Court in the 1980s, allows police officers to shoot to kill as long as they believe their life is in imminent danger — which Wilson has said he believes was the case. Given that, many were skeptical that the grand jury was going to indict Wilson, even if the only threshold was "probable cause."