Former department chief Michael De'Ath has been warned he could be found in contempt over repeated memory lapses of key conversations at the CFMEU inquiry.
Mr De'Ath has given evidence over two days on the alleged influence the union had over senior public servants and ministers.
Former Office of Industrial Relations director-general Peter McKay is set to give evidence on Thursday.
A former department chief has been warned he could be found in contempt after repeatedly failing to recall key conversations at Queensland's CFMEU inquiry.
The commission of inquiry into alleged union misconduct is this week examining the union's alleged influence over senior public servants and ministers under the former Labor government.
Office of Industrial Relations (OIR) director-general Michael De'Ath, who served under then-Labor minister Grace Grace between 2021 and 2024, has spent two days in the witness box.
He has faced intense questioning from counsel assisting Dimitri Ternovski over whether union pressure influenced departmental decisions.
Mr De'Ath repeatedly struggled to recall crucial conversations, even when confronted with phone calls, emails and other correspondence.
At the end of Wednesday's marathon hearing, Commissioner Stuart Wood KC flagged a possible contempt finding against Mr De'Ath.
He cited a High Court ruling that a "professed inability to remember" could amount to contempt if proven to be a "deliberate" refusal to answer questions.
