The South Australian government will argue in court that bodies-in-the-barrels accomplice Mark Ray Haydon poses an “appreciable risk to the safety of the community if not supervised”.

It is part of an application to the Supreme Court to have Haydon deemed a high-risk offender and subsequently supervised for up to five years, when his full sentence ends on May 20.

The government also wants the court to impose interim supervision conditions, in case a decision is still pending by that date.

Haydon is set to move into a low-security pre-release centre after being granted parole earlier this week, but it is unclear when he will be released into the community.

Any conditions imposed by the Parole Board will expire on May 20, prompting the government’s urgent Supreme Court application.

Mark Ray Haydon pictured after being escorted from a Supreme Court hearing.(AAP: Rob Hutchison)

It has requested a report on whether Haydon is likely to reoffend, despite the corrections department having already assessed the 65-year-old’s risk of reoffending as low.

The government argues that because of that low-risk assessment, Haydon has not participated in any “criminogenic treatment programs” while in custody.

It argues Haydon fits the current definition of a high-risk offender because he perverted the court of justice.

“By concealing human remains, interfering with evidence and impeding investigations into murder offences, the respondent [Haydon] obstructed the course of justice,” the application states.

“The respondent was capable of rendering substantial and sustained assistance to the principal offenders with knowledge that the men he was assisting were repeat murderers who might commit further murders.”

The application also refers to a psychologist’s report which states Haydon had “never learned life skills to deal with stress, lacked social skills, and used ‘inappropriate or maladaptive strategies’ to cope with problems”.

The application does not state when that report was produced.

The application was lodged on Wednesday – the day before amendments to expand the definition of a high-risk offender were passed by parliament, to close a loophole exposed by the Haydon case.

The infamous bank building in Snowtown.(ABC News: Che Chorley)

The government argues that under a supervision order, Haydon’s “associates in the community could be monitored and his reintegration to the community following a lengthy term in custody could be overseen by the Department for Correctional Services”.

It also argues it could provide rehabilitation and supervision targeted to Haydon’s needs, including establishing social networks and helping him to develop functional life skills.

Haydon’s behaviour ‘excellent’ in custody, parole board says

When the Parole Board granted Haydon parole earlier this week, presiding member Frances Nelson KC acknowledged the difficulties facing prisoners upon being released after many years behind bars.

“There’s always a challenge for anyone who’s leaving prison after a very long time,” she said.

“When you’ve been in a structured environment where you don’t have to think about when you get up, when you go to bed, what you do all day, what you eat and when you eat, and what clothing you wear, you lose the capacity to make decisions for yourself.

“Adjusting to the pressures of the outside world is a challenge for prisoners who’ve been inside for a long time.”

Mark Haydon (left) and John Bunting in custody.(ABC News)

Ms Nelson also characterised Haydon’s behaviour in custody as “excellent”.

“The Department of Correctional Services have assessed him as being a low risk of reoffending,” she said.

“There have been no incidents throughout his 25 years in prison which would indicate that he’s been inappropriate or aggressive or non-compliant.

“Certainly he’s very well aware of the effect that his part in these crimes has had on victims’ families … including very much his own, although to some extent he’s not close to his family because they weren’t a particularly functional family at the best of times.”

The state government’s application will be heard by the Supreme Court next week.