Joshua Jacques, 29, killed his girlfriend and three others while on probation in 2022.
There were "serious failings" in the probation supervision of a quadruple murderer, the chief inspector of probation has said.
Chief Inspector of Probation Martin Jones, who conducted an independent review into Jacques' supervision by the Probation Service, said it failed to organise a drug abuse intervention for Jacques, despite it being a condition of his release. Mr Jones said: "The case records show that Jacques was routinely using cannabis whilst on probation, and his licence contained a condition to engage in a drug abuse intervention on release from prison."No such intervention was organised by the Probation Service and our inspection found no evidence of a referral to a drugs agency."
Jacques was also assessed as posing a "high risk" of serious harm to the public before being released from custody, he said, but his risk to former partners or probation staff was "underestimated".