([1]) Duff worked for a number of dental practices in West Central Scotland in the late 1980s and early 1990s.
He was the recipient of a number of complaints (initially dismissed by authorities) about unnecessary dental work carried out on patients.
It was later revealed in disciplinary and court proceedings that he also exposed his patients to infection from diseases such as HIV and Hepatitis C due to his deliberate failure to follow standard sterilisation and hygiene procedures.
The issues surrounding the case were initially raised in the UK Parliament by Maria Fyfe MP for the Maryhill Constituency in Glasgow in series of debates in the British House of Commons.
In 2006 it was revealed that Duff was now working as a senior manager within the IT department of Inverclyde Council responsible for contract negotiation and implementation.