The Agriculture Ministry has ordered a crackdown on wrong-type chemicals and foreign substances added to rubber raw material, citing risks to quality, buyer confidence and Thai rubber's export position. Measures include awareness campaigns by the Rubber Authority of Thailand, a tip-off line at the Department of Agriculture's rubber division (0-2940-6407), and special inspection teams checking shops and premises, with action extended along the supply chain. If you buy, collect or sell rubber, check your suppliers' practices and make sure your own chain is clean, since violators can face legal action.