An elderly Brisbane woman missing for 12 days from inner-city Brisbane might have died in a bitter neighbourhood dispute over recycling.

Police are treating the disappearance of Lesley Trotter as a sudden death investigation as homicide detectives join the search for the 78-year-old's body.

Investigators on Friday said an extensive hunt led officers to believe she was dead after police initially conducted a missing-person search at Brisbane's Mt Coot-tha because Mrs Trotter was an avid hiker and bushwalker.

She last spoke to her family on March 27 and wasn't at her Toowong home when they visited the following day.

Detective Superintendent Andrew Massingham said police suspected Mrs Trotter died between midnight, March 27 and midday the next day.

"Unfortunately, investigations yesterday afternoon and late into the evening have led us to the conclusion that Mrs Trotter is in fact deceased," he said.

"The nature of that information specifically, I can't go into great detail. Suffice to say it is credible information we're acting on."

Police believe Mrs Trotter died close to her Toowong home. Crime scenes were established at her unit block and outside the complex.

More than 40 detectives are probing the disappearance, which might be linked to a dispute over recycling in the area.

"Mrs Trotter would often go to wheelie bins out the front of her residence or the neighbouring properties and remove recycling trash from general waste bins and transfer those into the correct bins," Det Supt Massingham said.

"We have not ruled out that this activity in some way is linked to her death."

Police said Mrs Trotter was well known in the neighbourhood for ensuring rubbish was put into the correct bins.

"Whether that's created some angst amongst the tenants, we're working through that at the moment," Det Supt Massingham said.

Adding to the family's distress was confirmation Mrs Trotter planned to leave the complex only to go missing before a final property settlement.

"This was a lady looking forward to the next chapter of her life. While she had some anxiety about moving into a retirement village, she was looking forward to that," Det Supt Massingham said.

"Something tragic has occurred on that Tuesday morning that's taken that opportunity away from her.

"At this stage, we do not have a location of Mrs Trotter's body, but we do have several lines of inquiry that may lead us to that location ... we do not know if the death is suspicious or not.

"It will take us some days to work through the evidence."

Mrs Trotter's family have been advised and are "deeply traumatised" by the tragic shift in the investigation, police say.

They had feared the worst after her mobile phone and wallet were found in the unit with her car still parked in her garage.

Det Supt Massingham said anyone with information or dash cam footage - particularly from between 5am and 7am on Tuesday, March 28 - should immediately contact police.

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Jarryd Hayne is too famous and his crime has attracted too much attention for him to spend a month with other criminals awaiting their fate after he was found guilty on two rape charges, his lawyer has convinced a judge.

Hayne will remain on bail until a sentencing hearing on May 8, Judge Graham Turnbull ruled on Thursday afternoon.

The 35-year-old former NRL star was escorted out of Downing Centre by sheriffs into a black Audi Q7 which took off from the Sydney court precinct at 5pm.

It had taken all day but Hayne's barrister Margaret Cunneen SC convinced the judge there were "special" or "exceptional" circumstances to delay Hayne entering custody, as required under recent changes to the bail act.

He was found guilty of two counts of sexual intercourse without consent on Tuesday after sexually assaulting a woman on the night of the 2018 NRL grand final.

Ms Cunneen called Hayne's wife, Amelia Bonnici, to the witness box in the NSW District Court on Thursday.

She cried when asked if the couple, married since 2021, had three children.

She was asked what the next few weeks would mean for her and her family without her husband.

"I can't even put that into words," she said.

The two-time Dally M Medal winner needs to be around to support and physically protect his family as they move out of Sydney before he returns to jail, Ms Cunneen told the court.

"It would be so oppressive to take this man from his family while those arrangements are made," she said.

The woman he assaulted in her suburban Newcastle bedroom cannot be identified.

A taxi waited outside as he played the woman songs on a laptop and watched the end of the grand final with her mother before performing non-consensual oral and digital sex on the woman for about 30 seconds.

They then cleaned blood off themselves and Hayne continued on his journey to Sydney.

Hayne cannot enter Newcastle under the conditions of his bail, which Ms Cunneen argued should be continued due to "unrelenting media pressure" on her famous client and the need to support his family.

"This particular offender would be a target in the general prison population," she said.

"He's going to jail," Judge Turnbull clarified.

"My problem at the moment is he's not going in as a sentenced prisoner, he's going in as a remand prisoner."

He was persuaded Hayne would be vulnerable if placed on remand in prison because he would not immediately be classified as a prisoner in need of protection.

Crown prosecutor John Sfinas said people were remanded in custody before sentencing all the time.

"All it comes down to is the offender is a high-profile footballer," Mr Sfinas said.

The small cells at Parklea, built to keep bikies separated around the time of the 1984 Milperra Massacre, would likely be Hayne's accommodation for weeks until he was sentenced, properly classified and likely moved to a more protected jail such as the Cooma Correctional Centre that last housed him, the judge said.

"The only reason he would be there is ... because he's Jarryd Hayne," he said.

Prior to being moved to Cooma when he served nine months of a previous sentence following a 2021 verdict overturned on appeal, Hayne quickly became a target in prison, his lawyer submitted.

The trial beginning in March was Hayne's third on charges laid in November 2018.

The jury in the first trial was discharged after being unable to reach a verdict.

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A platypus was removed from the wild before being taken via train to a major shopping centre and later released into a river, police believe.

Officers found the 26-year-old man accused of taking the animal from a waterway north of Brisbane on Thursday, who now faces serious protected animal charges.

It's alleged the man and a female companion were seen showing the animal to members of the public as they travelled to Caboolture shopping centre via train on Tuesday.

Police were told the monotreme dubbed Pete the platypus was later released into the Caboolture River, but its condition is unknown.

Railway squad officers found the man in Caboolture at 12.30pm on Thursday following appeals by the state's police commissioner and minister.

Police Commissioner Katarina Carroll earlier told the man to give himself up and that officers had footage of who they believed to be responsible.

"If you're watching this and you know who you are, can you please come to us because we will be out there looking for you," she told reporters earlier on Thursday.

Police Minister Mark Ryan said the incident was "a whole 'nother level of stupid".

"Peter needs to get home and you've done something very, very stupid," he said on Thursday morning.

The platypus was at risk of becoming sick, diseased or dying the longer it is out of its habitat, authorities said.

It should not have been fed or introduced to any new environments.

Taking a platypus from the wild is an offence under Queensland's Nature Conservation Act and a maximum penalty of more than $430,000 applies.

The man is due to face court on April 8.

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TikTok has been banned by the NSW, Northern Territory and Tasmanian governments, as states and territories fall into line with the Commonwealth, with the exception of WA.

The prohibitions on the Chinese-owned app follow intelligence agency advice about TikTok's parent company ByteDance, which focused on potential data harvesting.

The WA government has yet to formally ban TikTok but said it would follow advice from the Commonwealth, with WA Premier Mark McGowan saying he had deleted the app from his phone.

NT Chief Minister Natasha Fyles asked government employees to delete TikTok on phones with access to their government email account by Tuesday.

"We need to ensure our government networks and information are secure," Ms Fyles said.

NSW Premier Chris Minns said NSW government employees would be advised to implement the change as soon as possible, with the popular social media app to be scrubbed from their computers and phones.

Mr Minns said NSW government staff may still use TikTok on occasion to communicate with the public on issues like health.

"The NSW government will be implementing a number of mitigations to ensure that the security risk of this use is managed appropriately," he said.

The premier has deleted his own account, which was used heavily throughout the recent NSW election and had more than 10,000 followers.

"I deleted it last night. That's the advice from Cyber Security NSW," he told Sydney radio 2GB on Thursday.

"We've looked at other jurisdictions around the world - the European Union, the United States as well as the commonwealth government in the last 72 hours.

"We think it's the appropriate decision."

In Tasmania, Premier Jeremy Rockliff said the government was working to implement the policy which would be effective as soon as practicable.

Victorian Premier Daniel Andrews, who has more than 100,000 followers, will also delete his account.

Queensland Premier Annastacia Palaszczuk, with 30,000 followers, said she was still unsure as to whether she would delete her account.

"The federal government has not banned the accounts, it's about them being on government devices, we will listen to what the federal government says," she said.

Responding to the federal government ban earlier this week, TikTok executive Lee Hunter said there was no evidence the app posed a security risk.

"We are extremely disappointed by this decision which, in our view, is driven by politics, not by fact," he said.

© AAP 2023