The police initially ask to see the child, when the parents refused, RED FLAG, they obtained a warrant. At anytime the parents could have produced the child for a wellness check. What did they have to hide???
Working 45 years in healthcare, IMHO, I think the physician had reasons to report this. The physician was so concerned he called the ER for follow up. I suspect he tried a follow up contact with the parents, and they did not respond. They did not follow the physicians orders. This is a 2 yo. with a 105 temp, which can and often results in seizures and things can turn deadly, quick.
Healthcare, law enforcement, teachers, etc are mandated reporters. Everyone made the right call, IMHO.