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He hanged himself two days after receiving the summons. Law firm Pannone , acting for his family, says the paperwork was wrongly processed and Edward, of Didsbury, Manchester, should have been given only a warning.

Ex-head boy Edward Thornber, 17, was caught smoking the drug while on holiday in Cornwall.

The paperwork was wrongly processed and Edward should have been given only a warning

A spokesman for Pannone said: “There were at least seven opportunities to spot and rectify the error that were missed.”

Manchester coroner Nigel Meadows recorded a verdict of suicide on Friday.

He did not link the death in 2011 directly to Devon and Cornwall Police.

Edward’s mother Ann said: “We want to ensure the failings in procedure that we believe ultimately led to our son’s death do not happen again and lead to another tragedy.”