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When he was about 6, he ingested gasoline, leaving him with seizures that for years had to be treated with phenobarbital.

Soon after she arrived, a center staff member had delivered a shot full of phenobarbital and midazolam into her back haunch, to control the seizures.

The local health department there found four doctors guilty of misconduct and improper use of phenobarbital on about 20 children.

It remains unclear how the phenobarbital, a barbiturate often used to treat seizures and anxiety, or fentanyl, a powerful synthetic opioid similar to morphine but 50 to 100 times more potent, got in Grosso’s system.

The Orange County Sheriff-Coroner’s office later determined his cause of death as acute polydrug intoxication due to the combined effects of fentanyl and phenobarbital.