Roseanne Barr's teenage brain injury explains her later erratic behavior.

The finding

What the evidence shows

The injury is well documented: Barr was hit by a car as a teenager, suffered a traumatic brain injury, and was institutionalized for months afterward. Accounts differ on details such as her age (15 or 16) and the length of her stay (eight or nine months). The sweeping claim that the injury explains her later erratic behavior rests on her own accounts and lay interpretation. She has also described other conditions, and I found no medical evaluation linking the injury to her behavior decades later. A clinical assessment tying her later behavior to the injury would move this to true.