Associate Professor Phill Dawson, from the Centre for Research in Assessment and Digital Learning at Deakin University talked at the ANU Centre for Learning and Teaching (CLT) on Contract Cheating in Online Assessment. His new book "Defending Assessment Security in a Digital World: Preventing E-Cheating and Supporting Academic Integrity in Higher Education", is due out in October.
Professor Dawson surprised me by being mildly positive about the use of online invigilated examinations, while pointing out that the companies which provide these services were reluctant to have them independently tested. He was amused by my suggestion that a chromakey bodysuit could hide a helped in the background. ;-)