NSW Premier Barry O'Farrell has distanced himself from calls to personally intervene to protect abused children, saying it's up to the police commissioner to fill any shortfall in staffing.
The police squad tasked with protecting children from abusers is operating at 50 per cent below what's needed, according to a leaked human resources review.
The review says 50 cases were ready to proceed in January but suspects weren't arrested because of a lack of resources.
Wollongong detectives were dealing with 45 cases of child abuse when the recommended amount was no more than 15, with overworked officers forced out due to stress.
The review also warned that workloads were set to explode in the wake of the national royal commission into institutional responses to child abuse.
"We've got circumstances where perpetrators of the most heinous crimes against children are not being arrested," NSW Opposition Leader John Robertson told reporters in Sydney.
In question time in parliament on Tuesday, Mr O'Farrell said there had been 1700 police graduates since his government came to power.
"It is up to the police commissioner to allocate those resources as he sees fit ... and I am sure we will see additional commitments made," he said.
"We are giving police the numbers and the powers to get the job done."
Earlier, Police Minister Michael Gallacher slammed claims children at risk of abuse had remained in vulnerable situations.
"No child is left at risk," he said, adding it was difficult to attract officers to the squad.
"It is difficult, difficult work day in, day out."
Police said all 50 of the offenders identified in the review had been arrested in subsequent weeks, and the squad had been boosted by another 10 officers since January.
Mr Robertson said the number was pitiful given the report said a further 175 were needed, 50 of them critically.
"How many briefs are sitting there now because the resources just aren't there?" he asked.
Deputy Commissioner Catherine Burn acknowledged the squad was understaffed and said police were reviewing what could be done to get 40 additional officers in.
The report also warned of failed prosecutions in court due to deficiencies in police evidence briefs.
Mr Robertson said the government needed to prepare now for a spike in cases following the royal commission.
"These people deserve hope, they deserve justice and what they deserve is for the premier to personally intervene," he said.