He wrote the book about Eric Garner.  In the Current Rolling Stone, he says that prosecutors and District Attorneys intentionally delay the cases against police misconduct until the public fervor has moved on. They do this  by assemblying lots of extra evidence and testimony.  Also he says the powerful police unions give lots of money and support to politicians, who then delay and weaken the cases.  Then the DAs and prosecutors use police support to run for higher office, such as Congress and governor.  He mentions that police abuse records are kept secret.  He also writes on substack and podcasts.