Michael's guest this week is the Secretary-General of the world’s largest police organization, Dr Jürgen Stock, of INTERPOL, or to give it its full name, the International Criminal Police Organisation. It is based in Lyon, France.

Dr Stock has been Secretary General since 2014, and is now serving his second term. Prior to that he was Vice-President of the German Federal Criminal Police. He has a had a 40 year, distinguished career in law enforcement; and is also Honorary Professor for Law and Criminology, in the Faculty of Law, University of Giessen, in Germany.