A 17-year-old boy with shaggy blond hair stepped onto the scale at Tri-River Family Health Center in Uxbridge, Massachusetts. After he was weighed, he headed for an exam room decorated with decals of planets and cartoon characters. A nurse checked his blood pressure. A pediatrician asked about school, home life, and his friendships. This seemed like a routine teen checkup, the kind that happens in thousands of pediatric practices across the U.S. every day — until the doctor popped his next question. “Any cravings for opioids at all?” asked pediatrician Safdar Medina. The patient shook his head…