ASI Ghanshyam Singh was nabbed while offering Rs 38,000 to complainant Ratan Lal Jagir in a bid to make him withdraw his case, ACB Inspector General Umesh Mishra said.
Jagir had in February registered a case against Singh for demanding a bribe of Rs one lakh in return for the release of a relative of his who had been arrested allegedly on a false charge of disturbing peace.
However, refusing to fulfil the ASI's demand, Jagir had instead filed a complaint in the matter.
Mishra said a departmental inquiry was on against Singh and in order to weaken the investigation, the ASI had offered money to Jagir who again notified ACB about the move.
Singh had come to meet Jagir accompanied by an associate who, however, managed to escape after seeing the ACB sleuths.