Some reports of injuries to Zimmerman would, as good circumstantial evidence, corroborate Zimmerman’s version of events; i.e. cuts on the back of the head, broken nose, stains on the back of his shirt etc. In addition, medical reports from the Emergency Room where he was taken could also provide support or refutation of Zimmerman’s version of events.
The official police report (which has been posted on FR) provides this.
In addition, medical reports from the Emergency Room where he was taken could also provide support or refutation of Zimmerman’s version of events.
He didn't go to the ER. The police report specifically says that after he was treated on-site, they didn't see the need to take him there. He instead was taken to the police station.