THE White House should investigate whether PLA trucks are able to smuggle restricted technology across the border from Hong Kong to the mainland, Congress has urged. The administration is also being called on to review whether the SAR deserves to keep its separate export control status from Beijing, in light of recent allegations that China has been stealing American hi-tech secrets. But SAR officials last night insisted they had a tight system controlling the movement of sensitive, high-technology or military goods. A Trade and Industry Bureau spokesman would not directly address the question of whether Chinese military vehicles could be smuggling material, but emphasised Hong Kong's controls were tight. 'For our own commercial interest and as a responsible trading partner, we will continue to exercise the utmost vigilance in ensuring the integrity and credibility of our control system,' he said. In a White House reply to the House panel's recommendations, officials make it clear they believe current review procedures regarding Hong Kong's export control status are sufficient. The full 700-page report by the House panel, chaired by Congressman Christopher Cox, is still classified. But several of its recommendations have been declassified. The Cox committee's recommendation on Hong Kong says: 'The select committee recommends that appropriate congressional committees report legislation requiring appropriate executive departments and agencies to conduct an immediate study, followed by periodic reviews, of the sufficiency of Customs arrangements maintained by Hong Kong with respect to the PRC, and the appropriateness of continuing the SAR's differentiation from the PRC for US export control purposes. 'Such a study should consider, among other things, the implication of unmonitored border crossings by vehicles of the PLA.' Controversy arose when the head of the PLA advance party, Major-General Zhou Borong, criticised Customs officers for stopping him at the border in June 1997.