"...the Justice Department has cleared a Ferguson, Mo., police officer of civil rights violations in the death last August of Michael Brown.
In an 86-page report released Wednesday that detailed and evaluated the testimony of more than 40 witnesses, the Justice Department largely corroborated or found little credible evidence to contradict the account of the officer, Darren Wilson, who is white." (https://www.nytimes.com/2015/03/05/us/darren-wilson-is-cleared-of-rights-violations-in-ferguson-shooting.html?mcubz=0)

"...Wilson was absolved of willfully violating Brown’s civil rights...." (http://america.aljazeera.com/opinions/2015/3/doj-clears-wilson-but-excoriates-ferguson-police.html)

More than 40 witnesses.....little credible evidence.  
Why are you so adamant to convict him?