Mr Yusuf Nzibo, a commissioner at the electoral commission, was on Wednesday grilled by detectives from the anti-graft agency to shed light on the "Chickengate" scandal.
The ongoing investigations are targeting former commissioners and staff of the defunct Interim Independent Electoral Commission (IIEC).
The investigation is focussed on tender committee members who travelled to Britain to meet Smith and Ouzman officials, where part of the bribe is said to have been paid.
All officials who travelled to Britain have been asked to present their passports and to record statements.
A report by the British government received by the Attorney General has named commissioners and tender committee members who received money from Smith and Ouzman to help the company win a ballot paper printing tender.
Wednesday, Ethics and Anti-Corruption Commission spokesman Kairichi Marimba said: “We will release a new schedule on who will come next.”
On Tuesday, Mr Trevy Oyombra, the alleged mastermind of the scandal, was questioned over the multimillion-shilling "Chickengate" scandal accompanied by his lawyer, Mr Charles Kanjama.
Mr Nicholas Charles Smith, 43, who was Smith & Ouzman Ltd sales and marketing director, was jailed for three years by a British Court for bribing IIEC and Kenya National Examinations Council (KNEC) officials to win printing contracts.
Smith’s father, Mr Christopher John Smith, 71, the chairman of the company, got an 18-month suspended term for his role in the scandal in which top electoral commission and Knec officials pocketed millions.