Tupac murder trial: can the defendant's own words be used against him in court?

The trial of 63-year-old Duane Davis, accused of orchestrating the drive-by killing of rapper Tupac Shakur, is under way in Las Vegas more than three decades after the murder. A key legal question is whether the defendant's own statements can be used as evidence against him. Law lecturer Kim Langtree from the University of Salford offers analysis of the latest developments.