 From 2002-2004, Unimed had been legally authorized by the Mexican government to import thousands of metric tons of pseudoephedrine and ephedrine products into Mexico, as a part of its vast importation business.Pseudoephedrine and ephedrine products at the time were widely used in over-the-counter cold medications such as Sudafed, but could also be used by manufacturers of methamphetamine.Audits conducted by Mexican officials between 2002-06 at Unimed showed no improprieties such as improper diversion of any such chemicals.