Military hardware hidden in passengers' luggage will be virtually just as hard to detect at the new airport as at Kai Tak, a Customs and Excise source said yesterday. 'There is no simple and efficient way to detect strategic commodities' said Chief Superintendent Wong Sau-pui. A department source said that despite the installation of more advanced technology, Chek Lap Kok's capacity to detect tank components and missiles was little better than at Kai Tak. Mr Wong said passengers and cargo arriving from known drug-producing countries would be deemed 'high-risk' and subjected to more stringent inspection. 'Passenger and cargo numbers are always on the rise, but the department cannot increase staff endlessly, we have to be selective,' he said. He refused to pinpoint any particular country. 'We'll look at the current smuggling trend, travel pattern, origins and routes taken to determine our suspects,' Mr Wong said. In addition to technology used at Kai Tak, Chek Lap Kok will be equipped with four Ion Scan Sniffer Machines costing $700,000 each. The machines analyse tiny particles on the outside of baggage and can detect dangerous drugs and explosives in five seconds. A new method of urine analysis will also be in place. Customs and Excise staff will double to 1,045 at Chek Lap Kok, with the number of officers working on cargo detection up from about 200 to 500. The department will operate around the clock, as opposed to the 18-hour shift at Kai Tak.