2,697,539 - Number of blacks arrested in 2011
9,499,725 - Total number (all races) of arrests in 2011
>> This implies that 28% of arrests were black.
However, blacks make up only 13% of the population. Therefore, the 15% aggregated difference comprise people who were wrongly arrested - this is because races commit crime at an almost exact proportion equivalent to the ratio of their respective population. How is this discrepancy explained? That's right, racism.
link to www.fbi.gov