"The so-called code of silence mobilized. It involved destruction of evidence, falsification of reports, intimidation of witnesses, on and on," said Jamie Kalven, journalist.

Kalven has written a 20,000 word article about that so-called code of silence in the Chicago Police Department. He said it was never more evident than in the McDonald case. An attorney involved in the case agrees.

"Everyone at the scene knew what they were supposed to do. Everyone knew they were supposed to lie. Everyone knows what the official reports are gonna look like," said Craig Futterman, University of Chicago Law School.

Read more at ABC7 Chicago