The accused, identified as Suresh Kumar was posted with Goverdhanvilas police station some time back as a Sub-Inspector and was investigating a case of fraud lodged against one Madanlal.
He had then "demanded" the bribe for closing the case.
Meanwhile, he was transferred to Kurabad police station as an SHO but he was still "pressurising" Madanlal for the bribe, Additional SP, ACB, Umesh Kumar Ojha, said today.
"After verification of the complaint, a trap was laid and the accused was held at the house of Madanlal where he had gone to take the bribe amount yesterday," Ojha said, adding that he was later arrested.