Ray has been asked to write ‘Expert’ reports in around 150 cases and have testified in courts on over 50 occasions.

Among the cases/inquiries that he has been involved in are ‘The Lockerbie Inquiry/Bombing of flight Pan Am 103’ for The Scottish Criminal Cases Review Commission; ‘The Litvinenko Inquiry’; ‘The Longcare Inquiry’.

In 2022 Ray accepted the invitation to go to Krakow to attend two three-day meetings of international reviewers of research funding applications made to the Poland National Science Centre.

In 2018 he accepted the invitation to be a member of the small ’Steering Committee’ that is writing the extensive guidance document on investigative interviewing as recommended to the United Nations by its ‘Special Rapportuer’ Professor Juan Mendez.

In October 2017 he was appointed an ‘Assessor’ (ongoing) for the new National Dutch Register of Expert Witnesses (Nederlands Register Gerechtelik Deskundigen).

In 2015 Ray was commissioned by a large police organization to write a review of research relevant to how and when police who witness a fatal shooting should recall.

In 2004/5 Ray led a small team commissioned by the Scottish Executive to write guidance documents on the taking of evidence on commission and on the use of a supporter for vulnerable witness testimony.

Investigative interviewing. – Ray has been asked to write ‘Expert’ reports in around 150 cases and has testified in courts on over 50 occasions, including appeal courts. His expertise is on how well suspects, victims, and witnesses are interviewed.

Areas include: Interviewing, Suspects, Victims, Witnesses, Interrogating,