Besides, Madhavan, Preventive officer Sunil Kumar was also arrested, CBI sources said.
The two would be produced before the CBI Special Court tomorrow.
Madhavan and Sunil were arrested under the Prevention of Corruption Act for abusing their official position.
Another preventive officer, Sanjay Kumar Soni, is also listed as accused in the case.
The other accused in the case are Faiz T K, who was arrested from Delhi and brought to Kochi, Harris, his wife Arifa and Asifa.
The two women were arrested as they were about to leave the airport. The gold had been concealed in pouches of a jacket they had worn along with the burqa.
Customs has registered another case in which four persons have been arrested so far-- Arifa, Asifa, Harris and Faiz.
