A new law restricting the sale of cold medicines that contain an ingredient used to make methamphetamine took effect in Iowa Sunday.

The law, passed by the legislature this session, is designed to clamp down on homegrown meth in Iowa. The law targets pseudoephedrine, a decongestant found in many over-the-counter cold medicines. Those containing the drug can only be sold by pharmacists and customers are now required to show a photo ID and sign a logbook. Consumers will be limited to purchasing no more than 7,500 milligrams of pseudoephedrine in a 30-day period.

Authorities found nearly 1,500 meth labs in Iowa last year. While they expect the law to result in fewer labs, they don't expect it to solve the state's meth problem since it's estimated that 80% of meth used in Iowa is smuggled in from Mexico and the southwestern U.S.