Danai Supsin, director of the Prisoner Counsel and Development Division, said on Tuesday that prison staff earlier received a tip-off about people trying to smuggle prohibited items into Khao Bin prison.
During last night's surveillance, the guards found the video camera-equipped drone on a tree branch inside the prison compound. Two Nokia cell phones, four SIM cards, two Bluetooth devices, an integrated circuit and a pair of earphones were strapped to the unmanned aerial vehicle.
"If the two phones reached the hands of inmates, they would cost several millions of baht," Mr Danai said.
He said the drone controller had escaped after accidentally getting the vehicle in the tree.
Police will check with drone sellers to search for potential suspects who know how to use drones, he added.
Photos by Saichon Srinuanchan