Tasmania's corrections director has labelled as "inappropriate" some of the ideas of the former prisons boss Barry Greenberry.
An Upper House committee investigating overtime blowouts within the Justice Department has held its final public hearing.
The corrections director Robert Williams told the parliamentary inquiry some of Barry Greenberry's ideas were misguided, including a barbeque for staff who had not taken sick leave.
"That was the most, in my view, hare-brained idea I've ever heard of, because for the people who had cancer or a broken leg that was an enormous slap in the face."
Mr Williams also told the inquiry prison overtime costs have almost halved, putting paid to the 'myth' about rorting.
Overtime cost the State Government $4.76 million last financial year.
The inquiry heard that since July, overtime hours have fallen from almost 3,000 per fortnight to about 1,800.
Mr Williams says the cost to the service has fallen to nearly $100,000 a fortnight.
He believed the reduction "puts paid to the myth" prison staff use sick leave excessively.
He told the inquiry trust between staff and management was at its highest level in decades and the work of change manager Brian Edwards was a key factor.