Even if notified of convicted pedophile Danial Gratton's release from prison, the Edmonton Police Service would have not likely warned the public of his release, a former detective said Wednesday.

Wil Tonowski, a former employee in the High Risk Offender Unit, said Danial Gratton's history would have not prompted the police to notify the public of his release.

"He would not meet the criteria required by law to do a media release or public disclosure," he said.

As a rule, Tonowski says only high-risk offenders are red flagged for a public warning. Gratton was deemed to be a moderate to low risk to re-offend by his parole board. His records also show he completed the Phoenix Program at Alberta Hospital and his behaviour was positive.

"When a person appears to be on track and then he just goes off the rails, that can happen," he said.

Tonowski's comments come after a large public outcry emerged because no one was warned about Gratton's release in July 2006.

This week, police charged convicted pedophile Danial Todd Gratton with abducting and sexually assaulting two girls in separate incidents occurring in the last five days in Edmonton.

Meanwhile, federal corrections officials said they have launched a probe into why Edmonton police were never notified Gratton was living in the city.

Jeff Campbell, from Corrections Canada, said officials are looking into why no notification was requested.

"It appears that full notification does not have, may not have been made with the Edmonton Police are required," he said.

Court documents show Gratton has a long history of sexual assaults against children. He was declared a long-term offender in 2002.

He was sent to prison after being sentenced to six-year sentence for molesting six children. Court documents reveal one of his victims was sexually assaulted 70 times in a six-month period.

Gratton was later released early in 2005 after being granted full parole to a secure custody treatment facility where he received help for his sexual tendencies.

In July 2006, the parole board released him into the community when he showed positive progress -- two years before his six-year sentence expired.

In March 2008, his 10 years of supervision began. Corrections Canada was in charge of his conditions which included no contact with children.

Despite the public outroar over the handling of the case, Tonowski said the criminal and legal systems didn't fail the community.

"The bottom line is, the person to blame is the offender," he said.

With a report from CTV Edmonton's Erin Isfeld