But in the same conversation with a reliable source who demanded strict anonymity, it was also learnt that there is a fear of the investigation being “sabotaged by unnamed parties”.

Yusoff, whose police report earlier this month triggered a probe on the outrage of modesty by Bukit Aman’s Classified Criminal Investigation Unit (D5), will be meeting police at Bukit Aman this afternoon. This is the third time he has been summoned since Dec 9.

Top Bukit Aman officials have refused to give further details on the test today, or to comment on concerns of sabotage.

Yusoff’s latest appearance in Bukit Aman comes a day after his lawyer Haniff Khatri Abdulla said the 26-year-old was ready to take a polygraph test to help police validate his claims.

Polygraph tests, which have been used by the police, armed forces and Malaysian Anti-Corruption Commission in their investigations, provide physiological indicators during questioning, although they may not be admitted in court.

The test is also conducted subject to agreement by the parties involved.

The source, who has been in touch with FMT since the beginning of the investigation, said there had always been “a silent fear of sabotage” to scuttle investigations.

“That fear, whether imaginary or real, has always been there especially in cases involving powerful and influential men,” the source told FMT.

FMT could not independently verify the claim.

Anwar, who gave his statement to police last week before they followed him to his Bukit Segambut home as part of the investigation process, has assured of his full cooperation in the probe.