The decision not to charge the supermodel went against anti-drugs campaigns, says Pat Langham, president of the Girls' Schools Association. She insisted that it also sent out a message to children that taking drugs held few adverse consequences.
Kate Moss escaped prosecution in 2005 through a legal loophole, after the police were unable to prove which drug was involved. In a speech today, Mrs Langham stated that she will criticise the response to the allegations levelled at Moss.
Addressing the association's conference in Leeds, Mrs Langham, head of Wakefield Girls' High School, says celebrities should not be above the law.
"Teenagers need to see people who have broken the law suffer the consequences," she says.
"Celebrity status should not give people a 'get out of jail free' card, otherwise young people will think there are no consequences."
Moss made a public apology and said she had "let people down".
While she lost several modelling contracts in the wake of the scandal, she renewed or picked up lucrative contracts with the likes of Rimmel and Calvin Klein.