The letter had stated Jayalalithaa was not well and not in a position to sign and hence the left thumb impression was attested by the doctor which can be taken on file, principal secretary of the Election Commission K F Wilfred said.
Justice P Velmurugan had summoned the official for giving evidence on an election plea filed by P Saravanan, DMK candidate for the November 2016 Thirupparankundram assembly bypoll, challenging the election of AIADMK candidate A K Bose.
To another question whether the commission checked who authorised Madhusudhanan to give such a letter, the official said "We believed the letter be true."
Posting the matter to October 27, the judge directed Dr Balaji, who attested the thumb impression, to be present in court on that day with all the records.
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During the pendency of the case, Saravanan had filed an additional affidavit questioning the validity of the election documents.
He had also questioned the decision taken by the EC to accept the left thumb impression of Jayalalithaa affixed on documents filed in support of the nomination papers.
He further submitted that following the attestation, the AIADMK candidate (Bose) was allowed to contest using 'two leaves' symbol under the 'defective form A and form B' of the documents, which had materially "affected the outcome of the election".