Corrections admits their electronic monitoring technology can be tampered with.
The department is aware of offenders wrapping tinfoil around their ankle bracelets to interfere with the signal.
But it's not always the offenders to blame for weaknesses in the home detention system.
It's a not-so-secret 'house arrest hack' - wrapping tinfoil around an electronic monitoring device to disrupt the signal and essentially walk free.
"Some offenders are making their way around the process by foiling their bracelets and they are committing offending," said Police Assistant Commissioner Naila Hassan.
The Department of Corrections is aware of it too but playing it down.
"In regards to tampering with the equipment, in July it was around 1.4 percent of the entire population, so the reality is most people do comply with these orders, with this technology," said Corrections National Commissioner Leigh Marsh.
There's roughly 6500 people on electronic monitoring across all sentences, according to Corrections, so if 1.4 percent tampered with their ankle bracelets in July that's still about 90 people.
"That certainly is not fit for purpose, and if you combine that with the lack of resources in the system, victims are quite rightly concerned," said victim advocate Ruth Money.
"Like all technology, it is able to be challenged," Marsh said.
And footage obtained by Newshub shows it's not always the offenders creating weaknesses in the home detention system.
"It was taken off in error," footage shows a security officer telling a man. "OK I told them it was an error and they still took it off."
You heard that right - an officer from First Security, who are contracted by Corrections, admitting the man's electronic monitoring device was taken off in error.
"I was in bed sleeping, they turned up in the middle of the night and said they were there to take my bracelet off. I said, 'It's got to be a mistake, there's no reason why it should be coming off'," the man told Newshub.
"Refused to get it taken off at first, asked them to ring someone and double check. He came back five minutes later and said he'd been told to take it off."
The man contacted his lawyer but it was two days before a security officer arrived to rectify the mistake and put the bracelet back on.
"It could have gone a different way if I was a different person, yeah," they said.
"I have no words," Money said.
Corrections on Monday acknowledged an error had been made by a staff member and admitted the man was unmonitored for about 48 hours. It said it was an isolated incident but accepted it should not have happened.
And neither should these "house arrest hacks".
