Dr. Martin Huecker sees, on average, 10 methamphetamine addicts each month in his emergency room at the University of Louisville Health Sciences Center, sometimes three or four in an eight-hour shift. His experience signals a disturbing revival of a drug epidemic that plagued the country in the late 1990s and early 2000s.

“A lot of [increased use] probably has to do with availability, as the opioid pills have been harder and harder to find. So people will turn to methamphetamine,” Huecker told the Washington Examiner.“ A lot of dealers often take opioids that come from outside of the U.S. and add methamphetamine to them. And so that might be to make it more addictive and sell your product better.”