Last week, Mexican authorities seized over 23 tons of ethyl phenylacetate, which is used in the manufacture of methamphetamine. The drug component was discovered at the Pacific port of Manzanillo, in a shipment from China. In April 2010, Mexican officials seized 80 tons of phenylacetic acid and its derivatives shipped from Shanghai, China. Imports of ethyl phenylacetate require authorization from the country’s health ministry, so the shipments are intentionally mis-labeled before leaving China. Last year, an anonymous U.S. official told Reuters that between October and November 2010, Mexican authorities seized 818 tons of chemicals used in making crystal meth. Due...