This article is pretty damning towards Mike Cox and the Detroit Police Department. We already knew about Cox interviewing KK without him being under oath or deposition notes being taken, but now we, but now a state police investigator comes right out and says Cox tried to rush the investigation along.
As for the DPD, we have sealed evidence that was broken into and turned up missing--specifically, 911 calls about the Manoogian party.

http://www.freep.com/article/2009110...-tapes-vanish?