No-one has been caught for using drones to smuggle contraband drugs, tobacco and mobile phones into Scottish Prisons despite a series of Police Scotland investigations, The Ferret can reveal.
Scottish Prison Service records show that suspicious drone activity has been identified on five occasions near four Scottish prisons in 2016.
In four cases in which smuggling by drones was suspected, prison officials reported their concerns to Police Scotland. The fifth case was discovered by the police.