Dec 2, 2014
commented on A Prosecutor Has to Be Almost—or Actually—Trying to Not Get a Grand Jury Indictment
In almost all federal indictments the fact of a crime is not in question. It's a matter of probable cause to charge specific persons.
Most officer involved shootings don't result in indictments because they are deemed not to have been crimes at all. Perhaps it is in fact the case that generally when cops shoot people, they do so in good faith believing their own safety or the public's is at risk.