INVESTIGATIONS have been launched into the serious allegations about a former Northumbria Police officer.
Another force has revealed it has re-opened an investigation into a death and is now looking into the conduct of the 48-year-old man.
Also, the Independent Police Complaints Commission (IPCC) is now considering allegations that the North East officer carried out sub-standard work, and lied about his qualifications when involved in arson investigations.
Cleveland Police said it had uncovered concerns over the handling of 90 cases, but no further details on the re-opening of the case of the sudden death in its area have been released.
The man also worked for Staffordshire Police from 1996 to 2000 and Northumbria Police in 2002.
It has been established there were no concerns about his work here.
The officer was arrested on suspicion of perverting the course of justice in May 2011, and is on bail.
He was suspended from duty by Cleveland Police in February 2011 and resigned in October.
IPCC Commissioner Nicholas Long said: “This has been a long running and complex investigation involving three police forces and covering a period of 15 years.
“We wanted to ensure we reached a stage where we could inform those families directly affected rather than publicise the investigation earlier and possibly create concern for a larger number of people.
“The allegations are serious and had the potential to impact a large number of investigations.
“The number has been narrowed significantly by the work already undertaken.
“As this remains a criminal investigation we do not intend to go into specific detail about cases at this stage.”