140 In Walton, the events leading up to the commencement of the relevant proceedings against the medical practitioners had a lengthy history. The medical treatment the subject of the complaints (which, for convenience, may be called the 'new complaints') was a form of psychiatric treatment known as 'deep sleep therapy', which was administered together with electro-convulsive therapy. The deep sleep therapy was alleged to be of 'no medical worth' and 'unjustifiably dangerous'.[137] The treatment occurred in the period 1973 - 1978. Deep sleep therapy became a matter of political interest, and a form of departmental investigation was carried out in, it seems, the late 1970s.[138] A patient died as a result of the treatment and there was a coronial inquest. The coroner reported in 1982, when the matter was referred to the Attorney General. There was also major litigation between one of the doctors and a former patient, which was attended by substantial publicity. In 1982 and 1983, certain complaints were made against one of the practitioners, and in 1985 and 1986, the assistant secretary of the Department of Health laid a number of formal complaints under the relevant legislation against the medical practitioners. Those complaints were themselves the subject of an application for a stay on the basis that those proceedings constituted an abuse of process. In 1986, the court permanently stayed those original complaints.[139] In that proceeding, the court found that the delay in bringing proceedings was 'appalling and without justification' and that the failure to take action years earlier was 'inexcusable'.[140] There followed a Royal Commission into deep sleep therapy. One of the doctors subject to complaint (Dr Herron) gave evidence before the Royal Commission over 29 days. The Royal Commission was itself extremely critical of the delay on the part of the Health Department in investigating and pursuing complaints against the medical practitioners. After the conclusion of the Royal Commission, the Department initiated the new complaints against the medical practitioners. The new complaints were not identical with the original complaints which had previously been stayed, but they arose out of the same pattern of professional conduct as gave rise to the earlier complaints, and there was a substantial degree of overlapping of issues between the two.[141] In the New South Wales Court of Appeal, Gleeson CJ was not satisfied that the medical practitioners would not be able to obtain a fair trial by reason of the delay in bringing proceedings.[142] In relation to whether the continuation of the proceedings would be, of itself, so unfairly or unjustifiably oppressive as to constitute an abuse of process, his Honour considered that the matter was 'finely balanced', but the balance was tipped in favour of the granting of the stay.[143] His Honour, in that regard, was particularly influenced by the fact of the stay of the earlier proceedings in 1986. This was a consideration informed by the principle against double jeopardy.[144]