It’s going to be hard for the DOJ to prosecute the cop who killed Eric Garner

After calls from New York Senators Charles Schumer and Kirsten Gillibrand, Attorney General Eric Holder and New York Mayor Bill de Blasio announced a federal investigation into the death of Eric Garner.

Demanding a federal investigation is a good way for politicians like de Blasio, Schumer and Gillibrand to show their concern about police violence. Unfortunately it's not likely to bring justice for Garner.

Simple murder and manslaughter aren't federal crimes. But killing someone can be one in special circum