That one of the latest attempts to require prescriptions for cough-cold remedies containing pseudoephedrine appears headed for failure isn't just good news for the retailers that sell those products and the people who need them, it also may encourage those trying to curb the manufacture and use of methamphetamine to focus their efforts on methods that already work, such as the National Precursor Log Exchange, also known as NPLEx, a real-time, industry-funded electronic system that tracks sales of PSE products and is active in 17 states.