It ain’t.
Thank stringer Ruth Fuller and the Sun-Times desk for not bothering to look this up:
Tio Hardiman, former executive director of the group CeaseFire, also spoke at the gathering Saturday in Zion [to protest killing of 17-year-old by a policeman].
“Every 28 hours, an African American is shot or killed by a police officer in America,” Hardiman said. “Select — not all — police believe they are above the law.”
They could have done so easily, googling “every 28 hours” and finding something viral and false about this claim:
The figure “every 28 hours” comes from an April 2013 report titled “Operation Ghetto Storm” by the Malcolm X Grassroots Movement. The report analyzed officer-involved killings of African-American victims in 2012. The report “is a window offering a cold, hard, and fact-based view into the thinking and practice of a government and a society that will spare no cost to control the lives of Black people,” according to the preface.
However:
It’s not hard to debunk the claims using basic findings and methodologies from the report. (Twitter user @FeministaJones did it in a series of tweets using Storify.)
As for the rest of the debunking, you can look it up. As could Tio Hardiman, Ruth Fuller, and the entire Sun-Times organization, on whom and which, fie!