By "witnesses," do you mean other cops? Other cops that surely have no potential conflicts of interest? The "witnesses" that claim the officer was "run over" are at least a level, if not two, removed from the person who put such a thing in writing.

Here's the police report. Excuse the Gawker links, they are the first result on Google images:

http://i.kinja-img.com/gawker-media/image/upload/s--aE5jr2zd...

http://i.kinja-img.com/gawker-media/image/upload/s--_4cLZnsk...