It is the perfect combination of crap.
Cyrille Rossant may save a lot of lives, in both parents and children, if this becomes common knowledge.
It's the classic "N guilty men" problem, aka Blackstone's ratio: if you risk putting one innocent person in jail, how many guilty people you need to catch to make it morally justifiable? 5, 10? 100?
You have to pick a number, or else no kind of criminal justice can exist.
It's more likely that a fall (or being thrown) would cause the symptoms.
In any case, these situations are extremely rare, much more than those involving any kind of head impact.