PSA President Watson Duke has been discharged from hospital and is once again assisting police with an investigation.
This update was given this morning by TTPS PRO Acting Superintendent Wayne Mystar at the weekly media briefing.
He could not confirm what Mr Duke is being questioned about.
The union president was held by on Monday and had to be taken to the hospital in Mt Hope shortly after.
Reports claim that Mr. Duke was being questioned in connection with public statements he made months ago.