Dickson said a routine practice on the 12th floor where staff had to open a security door to talk to visitors rendered its security measures ineffective. He said the 5th floor Telecom Credit Union security measures were "adequate for all purposes except the visit of a maniac." On the 11th floor, no one could have perceived the possibility of a robbery or violence. Dickson said Vitkovic's visit to the Melbourne University counsellor in December 1986 could not be seen to have contributed to the killings. He said that Vitkovic probably brooded over the results of a Church of Scientology personality test given to him on 8 October 1987.