Yeah, not very much: Like the videotape of the thug committing a strong-arm robbery and assault just minutes before the confrontation with police, the x-rays of the officer's massive facial injuries, the Coroner's autopsy report, the testimony of twelve witnesses...
Regards,
They just have to find a judge who will rule any evidence about Michael Brown robbing the convenience store and any evidence about Darren Wilson’s injuries irrelevant...and dismiss all witness testimonies except for Dorain’s and Tiffany’s (a black woman who claims to have seen most of what happened from a short distance away).