A police-trained sniffer dog is being sent into some of the region's hospitals to try to prevent illegal drugs being brought in.
Coco will be used in six psychiatric hospitals across the North East to prevent dealers preying on vulnerable people.
Gary O'Hare, Security Director at St Nicholas Hospital in Newcastle, told ITV News about the new initiative.
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An estimated 90 employees, deemed potential victims, have now been taken to a reception centre where they will be spoken to by officers.
The tunnels were closed in 2013 for restoration that was expected to cost £4 million but actually, cost quadruple that amount.
25-year-old Aaron Armstrong died just weeks after his girlfriend took her own life. His family say they struggled to access support.