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Teachers have admitted they made a mistake when they sold sweets that had been confiscated from a pupil after he brought them into school.
Staff at Northfleet Technology College sold 18 Rolo and Yorkie cookies to other pupils after 13-year-old Jason Hill bought them in an attempt to sell to classmates.
Rules state unhealthy food and drinks will be confiscated when found in school but the items should have been disposed off instead of being sold.
Proceeds from the sale were donated to Nepal's earthquake victims following the deaths of nearly 9,000 people in April.
"He came home and said they've sold my stuff" - Mum Lisa Whitty
Mum Lisa complained to staff after her son told her the sweets had been sold, accusing of teachers of setting a bad example to pupils.
She said: "He came home and said they've sold my stuff.
"To me it's like they have stolen from him. They have rules you can't sell sweets in school yet because they are teachers they can do it.
"It's one rule for them and another for everyone else.
"I know he shouldn't have been selling the sweets but it was only get a Father Day's present.
"I'm disappointed I don't think it has been handled in the right way."
Miss Whitty has demanded an apology and for the cookies to be replaced.
Head teacher Jane Partridge admitted a mistake had been made but fell short of offering an apology over the incident - adding it wasn't the first time Jason had been caught with sweets.
She said: "In line with government legislation, schools are required to promote healthy eating. Northfleet Technology College works with parents to make sure that when their children are in school they have access to healthy food and drink.
"This pupil has been found on more than one occasion bringing in large quantities of unhealthy food and selling it to other students. These items have been confiscated.
"We acknowledge that on this occasion the items should have been disposed of and as a result, our procedures have been updated to make sure this will not happen again."
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