Chalmers to Cadder: Full Circle on Police Interrogation?

In this article, Peter Duff considers the issue of the stage at which otherwise unobjectionable police questioning of a witness or suspect must stop for reasons of the application of fundamental liberal principles, primarily the privilege against self-incrimination and the "equality of arms". The article examines the historical development of the law from the case of Chalmers v HMA, through the period of the Thomson Committee report, the case of Cadder v HMA, up to the present time.