In Colorado, nine have already joined in the action and more than a dozen cities and counties say they’re considering the move.
Expired or unused prescription drugs are dangerous when left behind in medicine cabinets.
Pueblo County commissioner Terry Hart, a Democrat, said his county has been one of the hardest hit by the state's opioid crisis.
Ten Colorado hospitals across the state participated in a six-month pilot project to cut opioid use called the Colorado Opioid Safety Collaborative.
Saturday marks National Prescription Drug Take Back Day.
Colorado doctors collected $4.6 million in payments over two years from opioid companies — the highest in the country based on population.
Denver's library is one of the first to carry Narcan, the brand name for Naloxone, a medication used to reverse an opioid overdose.
Pettersen wants to put forward a bill that would require drug makers to help pay for treatment programs in Colorado.