— By Tim Henderson for Stateline Since their peak less than three years ago, opioid overdose deaths have dropped nearly by half as of October, according to a Stateline analysis. The drop comes as a shrinking fentanyl supply has made the drug weaker and less deadly and volunteer efforts get more people into treatment. The weaker fentanyl tracks to a crackdown on materials used to make fentanyl in China around the time U.S. deaths started dropping…