Video at the link.

The first few paragraphs

Don't make a wrong move," the officer said as he pinned the struggling subject to the ground. "Period."

The officer tightened the handcuffs around the subject's thin wrists.

"Ow, ow, ow, it really hurts," the subject exclaimed.

The officer pressed his weight into the subject's small body while school staff watched it all unfold. The person he was restraining was 7 years old.

"If you, my friend, are not acquainted with the juvenile justice system, you will be very shortly," the officer told the child.

Earlier that day, the child allegedly spit at a teacher. Now, he was in handcuffs and a police officer was saying he could end up in jail.

That child — a second grader with autism at a North Carolina school — was ultimately pinned on the floor for 38 minutes, according to body camera video of the incident. At one point, court records say, the officer put his knee in the child's back.