stv's Bernard Ponsonby looks at the key questions facing the justice system faces with regard Scotland's prisons.

Should jails punish as a means of retribution for the victims of crime? Should penal policy not rehabilitate as well as punish to cut reoffending rates? A more basic question the justice system faces is a fundamental one -  does jail work? 

For many, it is not liberal enough, with policies being uncomfortably parked between the concerns of public opinion and criminal justice professionals, between the public's desire for toughness and the professionals' concerns with what works.