(Lancaster Online) They're called "heroin tourists" the hundreds of people traveling to Philadelphia every month because of its reputation for having purer heroin with better highs than other metropolitan areas.

Consequently, overdoses in public places have surged, including public libraries, where librarians have begun to stock Narcan to counteract overdoses that occur there.

Librarians have been called into duty so often to revive overdose victims, they have learned to tell the difference between a regular heroin overdose and a more deadly fentanyl overdose, by the sound the victim makes while collapsing, a story in Philly.com reports.

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