While African Americans make up approximately 17% of public school enrollment, they account for 31% of students identified as having mental retardation or intellectual disabilities, 28% of students labeled as having an emotional disturbance, and 21% of students who have learning disabilities

Personally, I think this may help to explain why so many young blacks get involved in crime and other anti-social activities. After all, you are not going to act like a normal person if your brain is abnormal.