 The Smithwick Tribunal also revealed serious concerns about the collusion of Gardai into murdering two Royal Ulster Constabulary officers in 1989.His time as Commissioner was further damaged by revelations of botched investigation procedures in regards to the murder of Sophie Toscan du Plantier in 1996.Callinan has also been scrutinized by journalist Gemma O'Doherty, who had pursued Callinan over allegations of penalty point cancellations, specifically in regards to Callinans own license.