BALTIMORE - Heroin has ravaged this city since the early 1960s, fueling desperation and crime that remain endemic in many neighborhoods. But lately, despite heroin's long, deep history here, users say it has become nearly impossible to find.

Heroin's presence is fading up and down the Eastern Seaboard, from New England mill towns to rural Appalachia, and in parts of the Midwest that were overwhelmed by it a few years back. It remains prevalent in many Western states, but even New York City, the nation's biggest distribution hub for the drug, has seen less of it this year.

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