One of five Ashley Youth Detention Centre workers currently on stress leave has been off work for the past three years.
This is while suspended youth justice officer Shaun Bartlett waits for a State Service code of conduct investigation to conclude.
About 17 months ago Mr Bartlett was stood down for his role following an incident with two detainees.
The Magistrates Court in July cleared Mr Bartlett of any wrongdoing during the incident, in which he restrained the two detainees who had been threatening officers, one with a shard of glass from a broken window.
Health and Community Services Union state secretary Tim Jacobson confirmed that one worker had been on stress leave for three years.
Mr Jacobson said he understood staff and the centre manager wanted Mr Bartlett back at work.
“Whilst I accept there is bureaucratic processes to be followed, the longer someone stays out of a workplace, the harder it is to get them back in,” Mr Jacobson said.
A government spokesman said privacy legislation prevented the Health and Human Services Department from providing workers compensation data on the small employee group at the youth detention centre.
“It could lead to identification of individuals and their health circumstances,” the spokesman said.
“This could also deter employees from engaging with our supportive injury management practices.”
There are 66 full-time equivalent employees at Ashley.
Of that number, 43.7 are youth justice workers.