Sunderland police are investigating the source of 15 ecstasy tablets which allegedly ended up in the hands of a schoolboy.
The teenager has been arrested and charged with possession of the Class A drug.
The 15-year-old was arrested at the unidentified secondary school on Monday after staff called police.
Sergeant Colin Stephenson of Sunderland West police said they were investigating. He said: "It is worrying that children are getting access to drugs.
"We are obviously investigating to find out where the drugs came from."
He is due to appear before city magistrates on Thursday. Police have not released the identity of the boy or the school.