Giving evidence at Christopher Michael Dawson's murder trial on Friday, former detective Damian Loone said the police had conducted proof of life checks through bank accounts, Medicare, social security and the Australian Taxation Office in 1999 and again in 2001.
"What was your belief as to whether or not there were any government records in existence pointing to Lynette Dawson nee Simms being alive?" asked crown prosecutor Craig Everson SC.
"There were no government records," Mr Loone replied.
The former police officer assisted with the investigation into Mrs Dawson's disappearance in the late 1990s and early 2000s before a second inquest in 2003.
Dawson, now 73, is accused of killing his wife and disposing of her body in January 1982 so he could have an unfettered relationship with a woman, known as JC, who was his babysitter and a student at the high school where he taught.
While Mrs Dawson's body has never been recovered, Mr Loone said he took on the investigation as a potential homicide rather than for a missing person.
He said conversations with Ray Butlin, whose wife said she saw Mrs Dawson at a fruit stall in Kulnara, north of Sydney, failed to change his mind regarding this.
However, he did not think that any evidence suggesting she was alive and well was a waste of time and not worth pursuing.
He admitted that a psychic had been brought to the Dawsons' Bayview home and that one of Mrs Dawson's daughters had undergone hypnosis during the investigation, but said this did not lead anywhere.
The NSW Supreme Court trial continues.
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