About 20 pupils at Moreton Community School in Wolverhampton were jabbed with a diabetic pen
A pupil who jabbed about 20 classmates with a diabetic pen has been made subject to a year-long behaviour plan.
The 11-year-old was arrested in June and later expelled from Moreton Community School in Wolverhampton.
The behaviour plan will see the pupil's attitude and attendance monitored. He will have to attend a health workshop and write apology letters to the affected pupils.
Although not part of the plan, he will also be enrolled in the Army Cadets.
Wolverhampton police Sgt Jake Flanagan said formally charging the youngster would not have been in the public interest.
"There was no sinister motive or malice behind his actions," he said.
The pupils who were jabbed received three rounds of precautionary hepatitis injections following the incident but no-one suffered an infection.