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It's reported 200 staff will be tested each year under rules.
Prison staff are to undergo random drug testing.
According to the Irish Daily Mail, around 5% of prison staff - or 200 workers - will be tested for illegal drugs each year under a new tender agreed by the Irish Prisons Service.
A further 200 drug tests will also be carried out each year on people who've applied to work with the I.P.S.