Squeezing the boy's neck, twisting his body and driving a fist into his back, a Palm Beach County school bus aide inflicted prolonged pain on a Lantana Elementary School student with autism in 2015, all while admonishing him to "take it like a man," a lawsuit alleges.

The bus aide, Christopher Barker, now 30, was investigated over the incident by school district police, who moved to arrest him on a child abuse charge but, the school district said, were overruled by state prosecutors. Barker was not arrested but resigned in October 2015, days before a vote by the school board to fire him.