17 April Case Updates R v Valdo Calocane, The Crown Court at Nottingham, 25 January 2024, unreported Psychiatry, Duty to the court, Interviewing witnesses, Public interest, 06. Rules and Regulations, 11. Report Writing, 15. Giving Oral Evidence The case of Valdo Calocane, convicted of diminished responsibility manslaughter, has brought to the public’s attention the role of expert psychiatric witnesses in cases of alleged murder. The case raises a number of issues about the role of expert witnesses in criminal proceedings, mental condition defences and the meaning of public interest.