Do they always conduct

[outtamojo]

Do they always conduct careful investigations? Are there no loopholes?

http://www.wsj.com/articles/hundreds-of-police-killings-are-uncounted-in-federal-statistics-1417577504

http://harvardlawreview.org/2015/04/enhancing-accountability-and-trust-with-independent-investigations-of-police-lethal-force/