Robert F. Kennedy Jr.'s new autism investigation raises questions: Why hasn't it been done?

Health and Human Services Secretary Robert F. Kennedy Jr. recently announced an effort to investigate the rise in autism in recent years .

Donna Brazile : 1 in 36 children now has autism, an over 300 percent increase since 2000 .

She says Kennedy has a responsibility to better Americans ’ health; if the disorder is preventable, society would benefit from preventing it.