As the issue of heroin addiction gets more awareness, there is still a class distinction with the tragedies more likely to manifest in certain social strata. So it doesn't percolate up through usual media channels.
One way to cut to the bone on the issue is to talk to funeral directors. One mortician I was chatting with the other day was telling me how causes of death change over time and the number of overdose deaths is astounding.
Yes, these things show up in obits but for privacy and modesty issues, the cause isn't publicized.
It would be an interesting news story to talk to the morticians as they have front row seats for these social changes.