U.S. street drug deaths keep dropping, but some Western states see deadly overdose surge

In this file photo, signs are displayed at a tent during a health event in Charleston, W.Va. Public health officials say the spread of naloxone, also known as Narcan, has dramatically reduced overdose deaths in the U.S.

Researchers say some structural changes in treating addiction are helping, including wider access to overdose reversing medication.

(Image credit: John Raby/AP)