The Crown has called its final witness in the fifth week of the Philip Polkinghorne murder trial.
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The witness was called to revisit earlier evidence presented by Polkinghorne's defence that suggested his wife's phone was used just hours before she was reported dead.
Polkinghorne, 71, is accused of killing Pauline Hanna and staging it to look like a suicide at Easter 2021.
But his defence says he found her already dead by suicide and there is nothing sinister.
The trial at the High Court earlier heard from an officer who probed the data from his and Pauline Hanna's phones.
Detective Andrew Reeves' evidence spanned three days.
The defence, cross-examining him, said two messages were drafted but not sent at about 4am on Easter Monday. The court has previously heard Polkinghorne alerted emergency services to Hanna's death just after 8am on April 5, Easter Monday.
Polkinghorne's lawyer Ron Mansfield told Reeves retained drafted messages was a feature of iPhones, where logs were recorded of messages being started.
One of the messages was said to have been drafted but not sent to Polkinghorne from Pauline Hanna's iPhone 8, and the other soon after to another person.
The Crown in response today called a police digital forensic analyst, Jun Lee, who reviewed the logs of Hanna's phone.
He told the court that it was not a case of a person using it but, rather, background processes in play.
"There was no user interaction on the phone at all," he said.
Lee said if the phone had been used a lot of other traces would have been left behind.
These included the phone recording movement, the phone being unlocked and the screen coming on.
"It's really straight forward because we deal with this every single day," he told Crown prosecutor Brian Dickey.
Mansfield, in cross examination, spent some time querying how iPhones send messages.
At one stage, Justice Lang interrupted the defence lawyer and suggested he ask his questions more directly.
Lee said phones always left digital traces of being picked up, unlocked and the screen activating and that these traces were always reliable.
He said he could not see those traces around the supposed draft messages.
He added that deleted messages can still be seen when a phone's data is extracted.
Further, if a message is typed but deleted before it is sent, then there will still be a sign of that, he said.
Lee will continue to be cross examined by Mansfield on Thursday, at which point the Crown case will close.
The Crown has portrayed Polkinghorne as a sometimes angry and controlling husband who was caught in a web of meth, infidelity and money troubles.
The defence has highlighted Pauline Hanna's years of depression and prescription drug use, long hours in a high stress job and a previous suicide attempt.
The trial began on July 29.
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