The smoking ban could spark riots in Scotland's jails, prison officers have warned.

Scotland's 6,800 inmates will be allowed to smoke only in their cells and in outdoor exercise yards after the ban comes into force at 6am on 26 March.Prison officers will have the job of policing the new law and many are already voicing concerns about how inmates, who are used to having a free rein to smoke during most of the day, will react to the policy.An agreement has already been reached at Kilmarnock prison, Scotland's only private jail, to restrict smoking to cells and the exercise yard. Detailed discussions have taken place between the Scottish Prison Service and prison officers' leaders about how to implement the law in Scotland's other jails.