Though it will not host the Apec Economic Leaders’ Meeting until November, the southern Chinese city of Shenzhen is already tightening its security, banning travellers on the subway from carrying perfume and imposing a no-fly zone for drones. The local government said in a notice on Sunday that subway passengers would be scanned and their carry-on items would be X-rayed to “completely ensure travel safety”. Besides items that have long been banned on the subway, such as explosives, the...