In this Aug. 4, 2013 photo, a man identified only as Pedro holds a leaf from a marijuana plant at his home in Mexico City. A group of leftist Mexico City lawmakers have introduced a bill, Thursday Feb 13, 2014, to legalize the sale of marijuana in the nation's capital. Since 2009, Mexico has allowed the possession of 5 grams of marijuana, about four joints, for personal use. (AP Photo/Marco Ugarte)MEXICO CITY (AP) — Leftist lawmakers in Mexico City’s legislature introduced a bill Thursday that would legalize the sale of marijuana within the capital, expanding on a national law that already decriminalizes the possession by users of small amounts of pot throughout the country.