M Nageshwar Rao was arrested after he flashed a fake ID card at Customs officials of the Rajiv Gandhi International Airport while returning from Vijayawada, a senior police official said.
Rao showed the ID when Customs officials wanted to know the source of the Rs 26 lakh he was carrying at the time, he added.
In a statement, Cyberabad police said Rao was passing himself off to the public as the Deputy Chief Investigation Officer of the Central Bureau of Investigation (CBI) and he had also made a fake ID.
Customs officials at the city airport called the police after they found on verification that the ID in Rao's possession was fake, they added.