A juvenile detainee featured in a Four Corners story into youth detention in the Northern Territory, Dylan Voller, has failed in his bid for parole.

The program, which showed footage of Voller restrained to a chair and wearing a spit hood, sparked a royal commission into the Northern Territory’s youth detention system.

Voller was 17 at the time he was restrained, but is now an adult at the correctional centre in Darwin.

The parole board did not release its reasons, but said it had provided the information to Voller’s lawyers.

A statement from the parole board confirmed Voller’s application for parole was denied on a number of grounds

“[These included] protection of victims, maintaining the privacy of a prisoner’s family, preserving clinical relationships that have been established between a prisoner and his or her rehabilitation providers, and the safety and wellbeing of the prisoner,” the parole board said.

It also said it was not the “normal practice” of the parole board to publish its reasons for refusing parole.

However, citing procedural fairness, the board said its detailed reasons for decision were provided to NAAJA, who represented Voller in his application for parole.

Not sure if Middlebrook had active part in decision: Chief Minister

In August, the ABC confirmed Ken Middlebrook, the former NT Corrections Commissioner who was present during the tear gassing of teenagers at the Don Dale detention centre, had been appointed to the parole board.

Northern Territory Chief Minister Michael Gunner said he was aware of the board’s decision, but not if Mr Middlebrook took an active part in it.

Northern Territory Chief Minister Michael Gunner.

“While I understand that Ken has significant experience in the corrections space, we thought considering he was dismissed it may not have been the most sensible of decisions,” he said.

Mr Gunner said his new government would also all appointments to all boards, including the parole board.

“While it might look like an odd decision, until we look at all boards and how they’re functioning I don’t want to make a personal comment on Ken,” he said.

“He was let go from his position as corrections commissioner and we will be reviewing the boards.”