Broken spinal cords are consistent with a heroin overdose?
It’s consistent with convulsion in the back of a van, not to mention difficulty breathing,cardiac arest, loss of consciousness, and coma, all of which Gray exhibited.
It is also consistent with some kinds of medical aid when a person is not breathing to try and clear their airway. Gray had to be intubated. He could easily have been injured by EMT’s or hospital staff. Happens all the time.