From a Scottish Prison Service Freedom of Information request, there were 9 sightings of drone activity near Scottish prisons in 2016. Of these, two resulted in packages being found in the grounds. In 2017, there were 12 incidents but only one package found within the grounds.
In 2018, the level of activity had plummeted to one incident, at Barlinnie, on Hogmanay, with 4 packages found. Officials have denied reports that these contained coal, black pudding, whisky and photographs of Idris Elba.