THE mother of murdered toddler James Bulger last night demanded a Home Office inquiry into the handling of the parole for her son's killers.
Denise Fergus is calling on Home Secretary Charles Clarke to order an urgent investigation into the conduct of the probation service and social workers controlling Robert Thomson and Jon Venables.
Her call comes 12 years after the pair, then aged 10, brutally tortured then murdered her two-year-old after they abducted him from the Strand Shopping centre in Bootle, north Liverpool, in 1993.
Mrs Fergus spoke out after a report that Thompson, now 23, is being prescribed the heroin substitute drug methadone.
A national newspaper said the killer became addicted to the Class A drug as he struggled to come to terms with what he had done as a child.
The same paper reported that Jon Venables had been treated at a hospital in Merseyside, after he was assaulted in June - which would be a direct breach of the terms of his parole.
Speaking from her home in Kirkby, Mrs Fergus, 38, said she was outraged Thompson's drug addiction had been "swept under the carpet".
A clause in the parole licence granted to Thompson and Venables by Mrs Justice Buffer was that neither should enter the county of Merseyside except under escort and with official permission.
Mrs Fergus said: "This is incredible information and the Home Office are not denying it. But I am not going to let them get off the hook over this.
"If Thompson's a heroin addict, I won't let them sweep it under the carpet with some kind of excuse.
"Taking a Class A drug must in itself be a breach of his parole.