But I'd expect the trend to trickle down to pharmacists and pharmacy techs, who handle the drugs quite often. It does happen, but I don't know if it happens as much as physicians.

The main curiosity to me is what leads these professions to develop a substance abuse problem in the first place? It isn't just opiates: If I remember correctly, nurses have a high rate of alcoholism. I nearly always have access to alcohol, and I don't drink regularly. Access in itself isn't nearly enough to cause addition or even use.