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There has been a 30% increase in the number of workers exposed for inappropriate relationships since 2017 to more than 40 a year, according to UK government figures.
Heather McKenzie was working at HMP Shotts - home to some of the country's most hardened criminals - when she teamed up with convicted murderer Zak Malavin to supply drugs to inmates.
A prison officer will stand trial accused of supplying an inmate with drugs at HMP Shotts.