Moneragala Police SSP Sisira Kumara had been arrested by the Special Task Force of Police (STF) with over 600 of Ganja plants at his official residence.
The STF said they also recovered a metal scanner during the raid.
The Ganja plants and the SSP were taken to the Moneragala Police station for further investigation.
The police constable driver of the SSP and four others including another police constable were also arrested along with the SSP. A jeep was also taken into the custody.
The raid was carried out following a tip off recived to the Uva Province Senior DIG.
Meanwhile, a senior police officer confirmed that the Criminal Investigation Department has taken over the investigation into the incident.
A special CID team has been sent to the Moneragala area for further investigation, he added.
Police spokesman SSP Nihal Thalduwa said deciplinery action will also be taken against the police officers.(Darshana Sanjeewa Balasuriya)