You also have to remember that the CT scan showed degeneration of the brain, and no blood flow.
I suppose they could repeat the CT scan and show even more degeneration. There are multiple tests and exams that are done.
I also have to state that the physicians that perform these tests are extremely aware of how emotional and sensitive the information is that they must convey. These are people that have to deal with inoperable tumors, severe brain disabilities, coma, vegetative states, and brain death. They regularly have to give devastating news to parents. These are kind and sensitive people who know they must tell the truth to parents. They are very strict in their examinations and not at all cavalier about interpreting the findings. Some issues are not black and white, but shades of grey. All the reports I have read about the physician reports on Jahi were unequivocal. She is brain dead. May she rest in peace.