http://www.cnn.com/2014/08/13/us/missouri-teen-shooting/index.html?hpt=hp_t1
“Ferguson’s police chief told CNN that the officer who shot Brown had been injured in the scuffle, and the Police Department issued a statement saying that “Ferguson mourns the loss of Michael Brown’s life” and that it had “heard the community’s cries for justice.”
The day after this incident in a live interview a reporter asked the police chief if the officer involved had any medical injuries and he said NO COMMENT.
If he is claiming injuries now then they are bogus.