Halorsing Kharumnuid (47) suffered the brutality before he was let off with warnings two days ago, East Khasi Hills district SP M Kharkrang said.
Seven of the eight accused were arrested this morning.
Last week, a village elder and two others were arrested after the district administration lodged a human right abuse complaint with the police after a man was forced to eat his own excreta on the charge of witchcraft.
This is the third such case reported to the administration in the past one year.