A judge has criticised calls to decriminalise cannabis after ruling that the drug caused and worsened the mental health problems of a man who went on to kill his 73-year-old mother. The case is being cited as evidence against relaxing UK drug laws, with the judge's remarks framed as a direct rebuttal to campaigners who argue cannabis should be legalised or decriminalised on safety grounds.

The available report does not include further specifics of the sentencing, the defendant's identity, or the exact circumstances of the killing, as the source text was largely obscured by unrelated site navigation and other headlines. The core reported facts are limited to the judge's condemnation of decriminalisation advocacy and the finding that cannabis use was a significant factor in the perpetrator's deteriorating mental state prior to the fatal attack on his mother.