Southern Arizona’s fentanyl crisis has escalated as Pima County officials warn of carfentanil—an elephant tranquilizer—found in seized counterfeit M30 pills.

In early February, deputies seized drugs and cash during a traffic stop in the Flowing Wells area, according to the Pima County Sheriff's Department.

Tucson and Pima County leaders recently touted collaborative efforts in addressing issues related to homelessness, drug use ...