When the state's worst sex and violence offenders finish doing time for their crimes, they are not completely free.
Some are at such high risk of committing the same offences that an application is made to invade their lives.
There are 37 people living in the community who are being watched on extended supervision orders.
These orders allow Corrective Services NSW to tag, monitor, counsel and visit them around the clock until they are capable of living on their own.
This can be done because the Supreme Court of NSW has granted an order that forces criminals to comply with the strictest of conditions on the outside.
If an offender breaches the conditions imposed on them, they can be sent back to jail for up to five years.
Among the 37 men under supervision are Skaf gang rapist Mohamed Sanoussi, who served 13 years of a maximum 16-year jail sentence for his role in a series of sexual assaults on young women before the 2000 Olympics.
Another is notorious Bulli rapist Terry John Williamson, who bound, gagged and raped 11 women and children at knifepoint during a 10-month rampage.
The Assistant Commissioner of Community Corrections, Rosemary Caruana, says the alternative to these orders is releasing an offender into the community with no supervision at all.
"The alternative would be nothing," she said. "If we didn't have this legislation they would be out there ... no supervising, no monitoring, no accountability – they would be out there now."
Every movement of a high-risk offender is tracked with a grey, 300-gram anklet that is lined with steel and anti-tamper plates.
The GPS signals are transmitted back to an electronic monitoring room, found within Sydney's Silverwater Correctional Complex.
The Smart Tag stores data and sets off alarms if the person goes into an exclusion zone, is late for a curfew or try to take the device off.
There is fierce resistance from some, and others would prefer to stay in jail, rather than be subject to such scrutiny.
The end game is making sure the community is safe but also helping these people eventually rehabilitate.
"It's the only way we can safeguard the community – we are never going to eliminate risk but we can minimise it," Ms Caruana says.
