"They were looking for people who had started on a prescription from a doctor or a dentist," says Bauer-Reese, an assistant professor of journalism at Temple University in Philadelphia. "They had essentially identified a story that they wanted to tell and were looking for a character who could tell that story."
Although this profile doesn't fit most people who become addicted, it is typical in reporting on opioids. Often, stories focus exclusively on people whose use started with a prescription; take this, from CNN ("It all started with pain killers after a dentist appointment."), and this, from New York's NBC affiliate ("He started taking Oxycontin after a crash.")
Alternatively, reporters downplay their subjects' earlier drug misuse to emphasize the role of the medical system, as seen in this piece from the Kansas City Star. The story, headlined "Prescription pills; addiction 'hell,'" features a woman whose addiction supposedly started after surgery, but only later mentions that she'd previously used crystal meth for six months.