KATHMANDU: Police have arrested a youth in possession of a cache of controlled pharmaceutical drugs from Nagdhunga of Chandragiri Municipality-3 on the western outskirts of Kathmandu on Monday. The 18-year-old Birendra Yadav of Lauki-2 in Sunsari district was arrested while a Kathmandu-bound bus (Na 6 Kha 4977) he was travelling on was stopped at Nagdhunga for routine security check. Meanwhile, police said they are looking into the case.