According to the ACB official, constable Ratiram, posted at the Jaipur Development Authority's police station, was arrested yesterday.
The official said one Ranglal Gujjar had approached the ACB a few days ago claiming that the constable had demanded bribe of Rs 50,000 to help him get his land related papers in a legal case.
The accused was working as a reader at JDA police station. The accused was booked under the anti-corruption act, they said.