Matt Richtel at the New York Times: Since the early 2000s, the number of fatal overdoses in the United States has soared. And the rate in Baltimore — 110 deaths per 100,000 residents, according to a recent analysis by the San Francisco Chronicle — is the highest among cities with a populations of a half-million or more. The initial cause was prescription opioids, then heroin, and then, starting a decade ago, a new generation of synthetic opioids…