Queensland's human rights watchdog says it wasn't consulted about state government plans to tighten youth justice laws, which it fears are being rushed through parliament.
The controversial bill will make it a criminal offence when children breach bail.
The proposed laws also increase the maximum penalties for car thefts, allow police to arrest kids on suspicion they may breach bail and make courts take into account - during sentencing - crimes that serious repeat offenders could hypothetically commit in the future.
Queensland Human Rights Commissioner Scott McDougall said he has been stonewalled by Premier Annastacia Palaszczuk about the bill, which could result in more children being kept behind bars without actually improving public safety.
"It was unfortunate: we did write to the premier and have not yet had a response," he told ABC Radio National on Friday.
The government admits the measures will override its own human rights laws, but claims the change is needed due to "exceptional circumstances" concerning the threat to public safety posed by youth offenders.
The government has allowed four days for public submissions on the bill, which will be investigated by a parliamentary committee for two weeks before the Labor-controlled parliament takes a vote.
The submission periods for most other legislation remains open for weeks, with parliamentary committee probes running for months.
Mr McDougall said making it a crime for children to breach bail will criminalise behaviour that's not unlawful and drag more young people into detention.
Most evidence showed that "incarceration and hyper-vigilant policing" didn't improve community safety, he said, but actually made it worse.
Capacity limits at the state's youth detention centres are being stretched and about 70 per cent of kids behind bars are First Nations children
"So we have more numbers of children in watch houses, spending longer periods of time, we're talking about 10 or 11 children in one cell, sharing one toilet, having to go to the toilet in front of their peers, sleeping on plastic mats, having no access to fresh air, daylight exercise, family limited, very limited access to education and health," Mr McDougall said.
"These are appalling conditions that we are tolerating in Australia today. And we cannot allow that inhumane treatment to be normalised.
"It's absolutely heartbreaking to visit these places and see the large numbers of Aboriginal and Torres Strait Islander children in there."
The commissioner said the laws go against Closing the Gap for Indigenous health and life expectancy, and there has been no consultation with Aboriginal Torres Strait Islander communities.
The commissioner said allowing police officers to arrest people under the age of 18 on the suspicion they could breach bail in future was akin to the 2002 science fiction film Minority Report.
"We simply can't allow these extraordinary powers to be given to police without a proper process of scrutiny," he said.
"And in Queensland, where we don't have an upper house overview, it's really important that we maintain our faith in the Human Rights Act."
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