A policeman was detained after he fled from a Maharashtra Anti Corruption Bureau trap on Friday with bribe money and then returned after changing the currency notes, which in such cases forms a vital part of evidence, an official said.

Ravindra Bhosale, attached to Kandivali police station, had allegedly demanded Rs 75,000 from a jeweller for not taking action in a case involving the purchase of 90 grams of stolen gold, and the latter had paid Rs 40,000, he said.