Both men are in custody ahead of a retrial after appealing convictions over a bungled plot to bring about $200 million worth of cocaine into Australia.
HM Inspectorate of Prisons said in its report that during a test carried out at inspection at HMP Hindley, 52 percent of inmates were positive for drugs.
More voters say they support a March ballot measure requiring suspected drug addicts to accept drug tests and treatment to continue getting cash benefits.