A Palamau Town Police Station team headed by its officer-in-charge Manoj Thakur reached the training centre at Tatisilwe on the outskirts of Ranchi city and arrested him, Palamau police chief N K Singh told reporters here.
Sunil Yadav was recruited last year and posted with the Palamau district police before being sent for the training, he said.
Yadav was wanted in Aurangabad district in alleged Maoist-related cases, he said.
The police got a tip-off that Yadav posed himself as 'hardcore' Maoist Abhayji to extort money in Aurangabad before he joined police force, the SP said.