Tay Eue Kam said she only received photocopies of the documents, including the minutes of a meeting between 1MDB’s board of advisers chairman (Najib) and then company CEO Shahrol Azral Ibrahim Halmi.

She said that because the documents were only photocopies, she was unable to use a microscope or any other device to verify their authenticity.

“Several dissimilarities were identified. But, (to get) a definitive conclusion requires an examination of the original document,” she said.

Asked by Najib’s lawyer, Shafee Abdullah, whether the signatures could have been lifted from another document and pasted onto the documents she was analysing, Tay said she could not exclude the possibility.

“It was rather impossible to examine (whether the signatures were copied and pasted) with this quality (of photocopies),” she said.

Najib is standing trial on 25 charges of abuse of power and money laundering over funds amounting to RM2.28 billion deposited into his AmBank accounts between February 2011 and December 2014.

Earlier today, Shafee told the court the defence might call another witness from Bukit Aman before they close their case.