<p>BEIJING (Reuters) - A Beijing factory recycled used Wu, who had no license to sell the goods, said he had sold 100,000 pairs a day when business was good.</p>
<p>China, on track to overtake the United States this year as the world's second-largest exporter, lacks the manpower to enforce food and drug safety regulations at home or for export. Imports are generally carefully scrutinized.</p>