An interim report released by independent private investigator Michael Leslie Squires, detailed that five of the six computers belonging to MACC officers had been analysed.
The tests revealed that on the night of July 16, 2008, two officers - Raymond Nion and Mohd Ashraf Mohd Yunus - were downloading pornography on their computers.
Squires' check on Ashraf's computer revealed that he had download movies, music and visited various pornography sites between midnight to 1.20am on the night that Teoh was being interrogated at the Selangor MACC headquarters.
He made similar findings on Nion.
On Thursday, chief commissioner Justice James Foong dropped the bombshell when he asked an MACC officer whether they were watching porn after office hours.
The Selangor MACC office was then located on the 14th and 15th floor of Plaza Massalam in Shah Alam.
Besides the two officers, Squires also checked the computers belonging to the former Selangor MACC deputy director Hishamuddin Hashim and found that he did not used it for any Internet browsing on July 16, 2009.
Meanwhile, checks on computers owned by another MACC officer, Khairul Anuar Alias, found that he used it to download movies, cartoons and music between midnight and 2.55am on July 16, while Mohd Anuar Ismail was used to download music and photographs.
Laptop not infected by virus
Squires also checked the laptop owned by recording officer Arman Alies and could not find any evidence it was infected by virus between June and August 2010.
"However, that is not absolute proof that it was not. But there is no evidence that it was subsequently repaired," he said.
Arman had earlier told the inquiry that he could not print the statement recorded from Teoh as demanded by the police as his laptop was not working.
Squires in his report also found that Hishamuddin was not called to face the MACC complaints committee, which was chaired by former Court of Appeal judge Mohd Noor Abdullah.
The inquiry panel also comprises former Federal Court judge Abdul
Kadir Sulaiman, former Appeals Court judge TS Nathan, Penang Hospital orensic pathologist Dr Bhupinder Singh and forensic psychiatric onsultant Prof Dr Mohamed Hatta Shaharom.
Teoh, 30, was found dead on July 16, 2009 on the 5th foor corridor of Plaza Masalam after giving his statement to the Selangor MACC.
The RCI will continue on Monday.